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 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(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 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \ 169 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE)) 170endif 171endif 172 173ifeq ($(CONFIG_KMSAN),y) 174_c_flags += $(if $(patsubst n%,, \ 175 $(KMSAN_SANITIZE_$(basetarget).o)$(KMSAN_SANITIZE)y), \ 176 $(CFLAGS_KMSAN)) 177_c_flags += $(if $(patsubst n%,, \ 178 $(KMSAN_ENABLE_CHECKS_$(basetarget).o)$(KMSAN_ENABLE_CHECKS)y), \ 179 , -mllvm -msan-disable-checks=1) 180endif 181 182ifeq ($(CONFIG_UBSAN),y) 183_c_flags += $(if $(patsubst n%,, \ 184 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \ 185 $(CFLAGS_UBSAN)) 186endif 187 188ifeq ($(CONFIG_KCOV),y) 189_c_flags += $(if $(patsubst n%,, \ 190 $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \ 191 $(CFLAGS_KCOV)) 192endif 193 194# 195# Enable KCSAN flags except some files or directories we don't want to check 196# (depends on variables KCSAN_SANITIZE_obj.o, KCSAN_SANITIZE) 197# 198ifeq ($(CONFIG_KCSAN),y) 199_c_flags += $(if $(patsubst n%,, \ 200 $(KCSAN_SANITIZE_$(basetarget).o)$(KCSAN_SANITIZE)y), \ 201 $(CFLAGS_KCSAN)) 202# Some uninstrumented files provide implied barriers required to avoid false 203# positives: set KCSAN_INSTRUMENT_BARRIERS for barrier instrumentation only. 204_c_flags += $(if $(patsubst n%,, \ 205 $(KCSAN_INSTRUMENT_BARRIERS_$(basetarget).o)$(KCSAN_INSTRUMENT_BARRIERS)n), \ 206 -D__KCSAN_INSTRUMENT_BARRIERS__) 207endif 208 209# $(srctree)/$(src) for including checkin headers from generated source files 210# $(objtree)/$(obj) for including generated headers from checkin source files 211ifeq ($(KBUILD_EXTMOD),) 212ifdef building_out_of_srctree 213_c_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj) 214_a_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj) 215_cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj) 216endif 217endif 218 219part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y) 220quiet_modtag = $(if $(part-of-module),[M], ) 221 222modkern_cflags = \ 223 $(if $(part-of-module), \ 224 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \ 225 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags)) 226 227modkern_rustflags = \ 228 $(if $(part-of-module), \ 229 $(KBUILD_RUSTFLAGS_MODULE) $(RUSTFLAGS_MODULE), \ 230 $(KBUILD_RUSTFLAGS_KERNEL) $(RUSTFLAGS_KERNEL)) 231 232modkern_aflags = $(if $(part-of-module), \ 233 $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \ 234 $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)) 235 236c_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 237 -include $(srctree)/include/linux/compiler_types.h \ 238 $(_c_flags) $(modkern_cflags) \ 239 $(basename_flags) $(modname_flags) 240 241rust_flags = $(_rust_flags) $(modkern_rustflags) @$(objtree)/include/generated/rustc_cfg 242 243a_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 244 $(_a_flags) $(modkern_aflags) 245 246cpp_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 247 $(_cpp_flags) 248 249ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) 250 251DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes 252 253dtc_cpp_flags = -Wp,-MMD,$(depfile).pre.tmp -nostdinc \ 254 $(addprefix -I,$(DTC_INCLUDE)) \ 255 -undef -D__DTS__ 256 257ifdef CONFIG_OBJTOOL 258 259objtool := $(objtree)/tools/objtool/objtool 260 261objtool-args-$(CONFIG_HAVE_JUMP_LABEL_HACK) += --hacks=jump_label 262objtool-args-$(CONFIG_HAVE_NOINSTR_HACK) += --hacks=noinstr 263objtool-args-$(CONFIG_CALL_DEPTH_TRACKING) += --hacks=skylake 264objtool-args-$(CONFIG_X86_KERNEL_IBT) += --ibt 265objtool-args-$(CONFIG_FINEIBT) += --cfi 266objtool-args-$(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL) += --mcount 267ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 268objtool-args-$(CONFIG_HAVE_OBJTOOL_NOP_MCOUNT) += --mnop 269endif 270objtool-args-$(CONFIG_UNWINDER_ORC) += --orc 271objtool-args-$(CONFIG_RETPOLINE) += --retpoline 272objtool-args-$(CONFIG_RETHUNK) += --rethunk 273objtool-args-$(CONFIG_SLS) += --sls 274objtool-args-$(CONFIG_STACK_VALIDATION) += --stackval 275objtool-args-$(CONFIG_HAVE_STATIC_CALL_INLINE) += --static-call 276objtool-args-$(CONFIG_HAVE_UACCESS_VALIDATION) += --uaccess 277objtool-args-$(CONFIG_GCOV_KERNEL) += --no-unreachable 278objtool-args-$(CONFIG_PREFIX_SYMBOLS) += --prefix=$(CONFIG_FUNCTION_PADDING_BYTES) 279 280objtool-args = $(objtool-args-y) \ 281 $(if $(delay-objtool), --link) \ 282 $(if $(part-of-module), --module) 283 284delay-objtool := $(or $(CONFIG_LTO_CLANG),$(CONFIG_X86_KERNEL_IBT)) 285 286cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool-args) $@) 287cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd) 288 289endif # CONFIG_OBJTOOL 290 291# Useful for describing the dependency of composite objects 292# Usage: 293# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add) 294define multi_depend 295$(foreach m, $1, \ 296 $(eval $m: \ 297 $(addprefix $(obj)/, $(call suffix-search, $(patsubst $(obj)/%,%,$m), $2, $3)))) 298endef 299 300# Copy a file 301# =========================================================================== 302# 'cp' preserves permissions. If you use it to copy a file in read-only srctree, 303# the copy would be read-only as well, leading to an error when executing the 304# rule next time. Use 'cat' instead in order to generate a writable file. 305quiet_cmd_copy = COPY $@ 306 cmd_copy = cat $< > $@ 307 308$(obj)/%: $(src)/%_shipped 309 $(call cmd,copy) 310 311# Commands useful for building a boot image 312# =========================================================================== 313# 314# Use as following: 315# 316# target: source(s) FORCE 317# $(if_changed,ld/objcopy/gzip) 318# 319# and add target to 'targets' so that we know we have to 320# read in the saved command line 321 322# Linking 323# --------------------------------------------------------------------------- 324 325quiet_cmd_ld = LD $@ 326 cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@ 327 328# Archive 329# --------------------------------------------------------------------------- 330 331quiet_cmd_ar = AR $@ 332 cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs) 333 334# Objcopy 335# --------------------------------------------------------------------------- 336 337quiet_cmd_objcopy = OBJCOPY $@ 338cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ 339 340# Gzip 341# --------------------------------------------------------------------------- 342 343quiet_cmd_gzip = GZIP $@ 344 cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@ 345 346# DTC 347# --------------------------------------------------------------------------- 348DTC ?= $(objtree)/scripts/dtc/dtc 349DTC_FLAGS += -Wno-interrupt_provider \ 350 -Wno-unique_unit_address 351 352# Disable noisy checks by default 353ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),) 354DTC_FLAGS += -Wno-unit_address_vs_reg \ 355 -Wno-avoid_unnecessary_addr_size \ 356 -Wno-alias_paths \ 357 -Wno-graph_child_address \ 358 -Wno-simple_bus_reg 359else 360DTC_FLAGS += \ 361 -Wunique_unit_address_if_enabled 362endif 363 364ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),) 365DTC_FLAGS += -Wnode_name_chars_strict \ 366 -Wproperty_name_chars_strict \ 367 -Winterrupt_provider \ 368 -Wunique_unit_address 369endif 370 371DTC_FLAGS += $(DTC_FLAGS_$(basetarget)) 372 373# Set -@ if the target is a base DTB that overlay is applied onto 374DTC_FLAGS += $(if $(filter $(patsubst $(obj)/%,%,$@), $(base-dtb-y)), -@) 375 376# Generate an assembly file to wrap the output of the device tree compiler 377quiet_cmd_wrap_S_dtb = WRAP $@ 378 cmd_wrap_S_dtb = { \ 379 symbase=__$(patsubst .%,%,$(suffix $<))_$(subst -,_,$(notdir $*)); \ 380 echo '\#include <asm-generic/vmlinux.lds.h>'; \ 381 echo '.section .dtb.init.rodata,"a"'; \ 382 echo '.balign STRUCT_ALIGNMENT'; \ 383 echo ".global $${symbase}_begin"; \ 384 echo "$${symbase}_begin:"; \ 385 echo '.incbin "$<" '; \ 386 echo ".global $${symbase}_end"; \ 387 echo "$${symbase}_end:"; \ 388 echo '.balign STRUCT_ALIGNMENT'; \ 389 } > $@ 390 391$(obj)/%.dtb.S: $(obj)/%.dtb FORCE 392 $(call if_changed,wrap_S_dtb) 393 394$(obj)/%.dtbo.S: $(obj)/%.dtbo FORCE 395 $(call if_changed,wrap_S_dtb) 396 397quiet_cmd_dtc = DTC $@ 398cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \ 399 $(DTC) -o $@ -b 0 \ 400 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \ 401 -d $(depfile).dtc.tmp $(dtc-tmp) ; \ 402 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) 403 404quiet_cmd_fdtoverlay = DTOVL $@ 405 cmd_fdtoverlay = $(objtree)/scripts/dtc/fdtoverlay -o $@ -i $(real-prereqs) 406 407$(multi-dtb-y): FORCE 408 $(call if_changed,fdtoverlay) 409$(call multi_depend, $(multi-dtb-y), .dtb, -dtbs) 410 411ifneq ($(CHECK_DTBS)$(CHECK_DT_BINDING),) 412DT_CHECKER ?= dt-validate 413DT_CHECKER_FLAGS ?= $(if $(DT_SCHEMA_FILES),-l $(DT_SCHEMA_FILES),-m) 414DT_BINDING_DIR := Documentation/devicetree/bindings 415DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.json 416 417quiet_cmd_dtb = DTC_CHK $@ 418 cmd_dtb = $(cmd_dtc) ; $(DT_CHECKER) $(DT_CHECKER_FLAGS) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ || true 419else 420quiet_cmd_dtb = $(quiet_cmd_dtc) 421 cmd_dtb = $(cmd_dtc) 422endif 423 424$(obj)/%.dtb: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE 425 $(call if_changed_dep,dtb) 426 427$(obj)/%.dtbo: $(src)/%.dtso $(DTC) FORCE 428 $(call if_changed_dep,dtc) 429 430dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp) 431 432# Bzip2 433# --------------------------------------------------------------------------- 434 435# Bzip2 and LZMA do not include size in file... so we have to fake that; 436# append the size as a 32-bit littleendian number as gzip does. 437size_append = printf $(shell \ 438dec_size=0; \ 439for F in $(real-prereqs); do \ 440 fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \ 441 dec_size=$$(expr $$dec_size + $$fsize); \ 442done; \ 443printf "%08x\n" $$dec_size | \ 444 sed 's/\(..\)/\1 /g' | { \ 445 read ch0 ch1 ch2 ch3; \ 446 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \ 447 printf '%s%03o' '\\' $$((0x$$ch)); \ 448 done; \ 449 } \ 450) 451 452quiet_cmd_file_size = GEN $@ 453 cmd_file_size = $(size_append) > $@ 454 455quiet_cmd_bzip2 = BZIP2 $@ 456 cmd_bzip2 = cat $(real-prereqs) | $(KBZIP2) -9 > $@ 457 458quiet_cmd_bzip2_with_size = BZIP2 $@ 459 cmd_bzip2_with_size = { cat $(real-prereqs) | $(KBZIP2) -9; $(size_append); } > $@ 460 461# Lzma 462# --------------------------------------------------------------------------- 463 464quiet_cmd_lzma = LZMA $@ 465 cmd_lzma = cat $(real-prereqs) | $(LZMA) -9 > $@ 466 467quiet_cmd_lzma_with_size = LZMA $@ 468 cmd_lzma_with_size = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@ 469 470quiet_cmd_lzo = LZO $@ 471 cmd_lzo = cat $(real-prereqs) | $(KLZOP) -9 > $@ 472 473quiet_cmd_lzo_with_size = LZO $@ 474 cmd_lzo_with_size = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@ 475 476quiet_cmd_lz4 = LZ4 $@ 477 cmd_lz4 = cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout > $@ 478 479quiet_cmd_lz4_with_size = LZ4 $@ 480 cmd_lz4_with_size = { cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout; \ 481 $(size_append); } > $@ 482 483# U-Boot mkimage 484# --------------------------------------------------------------------------- 485 486MKIMAGE := $(srctree)/scripts/mkuboot.sh 487 488# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces 489# the number of overrides in arch makefiles 490UIMAGE_ARCH ?= $(SRCARCH) 491UIMAGE_COMPRESSION ?= $(or $(2),none) 492UIMAGE_OPTS-y ?= 493UIMAGE_TYPE ?= kernel 494UIMAGE_LOADADDR ?= arch_must_set_this 495UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR) 496UIMAGE_NAME ?= Linux-$(KERNELRELEASE) 497 498quiet_cmd_uimage = UIMAGE $@ 499 cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \ 500 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \ 501 -T $(UIMAGE_TYPE) \ 502 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \ 503 -n '$(UIMAGE_NAME)' -d $< $@ 504 505# XZ 506# --------------------------------------------------------------------------- 507# Use xzkern to compress the kernel image and xzmisc to compress other things. 508# 509# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage 510# of the kernel decompressor. A BCJ filter is used if it is available for 511# the target architecture. xzkern also appends uncompressed size of the data 512# using size_append. The .xz format has the size information available at 513# the end of the file too, but it's in more complex format and it's good to 514# avoid changing the part of the boot code that reads the uncompressed size. 515# Note that the bytes added by size_append will make the xz tool think that 516# the file is corrupt. This is expected. 517# 518# xzmisc doesn't use size_append, so it can be used to create normal .xz 519# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very 520# big dictionary would increase the memory usage too much in the multi-call 521# decompression mode. A BCJ filter isn't used either. 522quiet_cmd_xzkern = XZKERN $@ 523 cmd_xzkern = cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh > $@ 524 525quiet_cmd_xzkern_with_size = XZKERN $@ 526 cmd_xzkern_with_size = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \ 527 $(size_append); } > $@ 528 529quiet_cmd_xzmisc = XZMISC $@ 530 cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@ 531 532# ZSTD 533# --------------------------------------------------------------------------- 534# Appends the uncompressed size of the data using size_append. The .zst 535# format has the size information available at the beginning of the file too, 536# but it's in a more complex format and it's good to avoid changing the part 537# of the boot code that reads the uncompressed size. 538# 539# Note that the bytes added by size_append will make the zstd tool think that 540# the file is corrupt. This is expected. 541# 542# zstd uses a maximum window size of 8 MB. zstd22 uses a maximum window size of 543# 128 MB. zstd22 is used for kernel compression because it is decompressed in a 544# single pass, so zstd doesn't need to allocate a window buffer. When streaming 545# decompression is used, like initramfs decompression, zstd22 should likely not 546# be used because it would require zstd to allocate a 128 MB buffer. 547 548quiet_cmd_zstd = ZSTD $@ 549 cmd_zstd = cat $(real-prereqs) | $(ZSTD) -19 > $@ 550 551quiet_cmd_zstd22 = ZSTD22 $@ 552 cmd_zstd22 = cat $(real-prereqs) | $(ZSTD) -22 --ultra > $@ 553 554quiet_cmd_zstd22_with_size = ZSTD22 $@ 555 cmd_zstd22_with_size = { cat $(real-prereqs) | $(ZSTD) -22 --ultra; $(size_append); } > $@ 556 557# ASM offsets 558# --------------------------------------------------------------------------- 559 560# Default sed regexp - multiline due to syntax constraints 561# 562# Use [:space:] because LLVM's integrated assembler inserts <tab> around 563# the .ascii directive whereas GCC keeps the <space> as-is. 564define sed-offsets 565 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \ 566 /^->/{s:->#\(.*\):/* \1 */:; \ 567 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \ 568 s:->::; p;}' 569endef 570 571# Use filechk to avoid rebuilds when a header changes, but the resulting file 572# does not 573define filechk_offsets 574 echo "#ifndef $2"; \ 575 echo "#define $2"; \ 576 echo "/*"; \ 577 echo " * DO NOT MODIFY."; \ 578 echo " *"; \ 579 echo " * This file was generated by Kbuild"; \ 580 echo " */"; \ 581 echo ""; \ 582 sed -ne $(sed-offsets) < $<; \ 583 echo ""; \ 584 echo "#endif" 585endef 586