scripts/Makefile.lib

   1 # SPDX-License-Identifier: GPL-2.0
   2 # Backward compatibility
   3 asflags-y  += $(EXTRA_AFLAGS)
   4 ccflags-y  += $(EXTRA_CFLAGS)
   5 cppflags-y += $(EXTRA_CPPFLAGS)
   6 ldflags-y  += $(EXTRA_LDFLAGS)
   7
   8 # flags that take effect in current and sub directories
   9 KBUILD_AFLAGS += $(subdir-asflags-y)
  10 KBUILD_CFLAGS += $(subdir-ccflags-y)
  11 KBUILD_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
  18 obj-m := $(filter-out $(obj-y),$(obj-m))
  19
  20 # Libraries are always collected in one lib file.
  21 # Filter out objects already built-in
  22 lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
  23
  24 # Subdirectories we need to descend into
  25 subdir-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
  36 ifdef need-modorder
  37 obj-m := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m))
  38 else
  39 obj-m := $(filter-out %/, $(obj-m))
  40 endif
  41
  42 ifdef need-builtin
  43 obj-y           := $(patsubst %/, %/built-in.a, $(obj-y))
  44 else
  45 obj-y           := $(filter-out %/, $(obj-y))
  46 endif
  47
  48 ifdef need-dtbslist
  49 dtb-y           += $(addsuffix /dtbs-list, $(subdir-ym))
  50 always-y        += dtbs-list
  51 endif
  52
  53 # Expand $(foo-objs) $(foo-y) etc. by replacing their individuals
  54 suffix-search = $(strip $(foreach s, $3, $($(1:%$(strip $2)=%$s))))
  55 # List composite targets that are constructed by combining other targets
  56 multi-search = $(sort $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $m)))
  57 # List primitive targets that are compiled from source files
  58 real-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
  61 multi-obj-y := $(call multi-search, $(obj-y), .o, -objs -y)
  62 multi-obj-m := $(call multi-search, $(obj-m), .o, -objs -y -m)
  63 multi-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
  67 real-obj-y := $(call real-search, $(obj-y), .o, -objs -y)
  68 real-obj-m := $(call real-search, $(obj-m), .o, -objs -y -m)
  69
  70 always-y += $(always-m)
  71
  72 # hostprogs-always-y += foo
  73 # ... is a shorthand for
  74 # hostprogs += foo
  75 # always-y  += foo
  76 hostprogs += $(hostprogs-always-y) $(hostprogs-always-m)
  77 always-y += $(hostprogs-always-y) $(hostprogs-always-m)
  78
  79 # userprogs-always-y is likewise.
  80 userprogs += $(userprogs-always-y) $(userprogs-always-m)
  81 always-y += $(userprogs-always-y) $(userprogs-always-m)
  82
  83 # DTB
  84 # If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
  85 dtb-$(CONFIG_OF_ALL_DTBS)       += $(dtb-)
  86
  87 # Composite DTB (i.e. DTB constructed by overlay)
  88 multi-dtb-y := $(call multi-search, $(dtb-y), .dtb, -dtbs)
  89 # Primitive DTB compiled from *.dts
  90 real-dtb-y := $(call real-search, $(dtb-y), .dtb, -dtbs)
  91 # Base DTB that overlay is applied onto
  92 base-dtb-y := $(filter %.dtb, $(call real-search, $(multi-dtb-y), .dtb, -dtbs))
  93
  94 always-y                        += $(dtb-y)
  95
  96 # Add subdir path
  97
  98 ifneq ($(obj),.)
  99 extra-y         := $(addprefix $(obj)/,$(extra-y))
 100 always-y        := $(addprefix $(obj)/,$(always-y))
 101 targets         := $(addprefix $(obj)/,$(targets))
 102 obj-m           := $(addprefix $(obj)/,$(obj-m))
 103 lib-y           := $(addprefix $(obj)/,$(lib-y))
 104 real-obj-y      := $(addprefix $(obj)/,$(real-obj-y))
 105 real-obj-m      := $(addprefix $(obj)/,$(real-obj-m))
 106 multi-obj-m     := $(addprefix $(obj)/, $(multi-obj-m))
 107 dtb-y           := $(addprefix $(obj)/, $(dtb-y))
 108 multi-dtb-y     := $(addprefix $(obj)/, $(multi-dtb-y))
 109 real-dtb-y      := $(addprefix $(obj)/, $(real-dtb-y))
 110 subdir-ym       := $(addprefix $(obj)/,$(subdir-ym))
 111 endif
 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.
 115 modname-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
 120 modname = $(subst $(space),:,$(__modname))
 121 modfile = $(addprefix $(obj)/,$(__modname))
 122
 123 # target with $(obj)/ and its suffix stripped
 124 target-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)
 129 name-fix-token = $(subst $(comma),_,$(subst -,_,$1))
 130 name-fix = $(call stringify,$(call name-fix-token,$1))
 131 basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
 132 modname_flags  = -DKBUILD_MODNAME=$(call name-fix,$(modname)) \
 133                  -D__KBUILD_MODNAME=kmod_$(call name-fix-token,$(modname))
 134 modfile_flags  = -DKBUILD_MODFILE=$(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 #
 155 ifeq ($(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                 $(CFLAGS_GCOV))
 159 endif
 160
 161 #
 162 # Enable address sanitizer flags for kernel except some files or directories
 163 # we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
 164 #
 165 ifeq ($(CONFIG_KASAN),y)
 166 ifneq ($(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), $(CFLAGS_KASAN_NOSANITIZE))
 170 endif
 171 endif
 172
 173 ifeq ($(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)
 180 endif
 181
 182 ifeq ($(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                 $(CFLAGS_UBSAN_SIGNED_WRAP))
 189 endif
 190
 191 ifeq ($(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         $(CFLAGS_KCOV))
 195 endif
 196
 197 #
 198 # Enable KCSAN flags except some files or directories we don't want to check
 199 # (depends on variables KCSAN_SANITIZE_obj.o, KCSAN_SANITIZE)
 200 #
 201 ifeq ($(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__)
 210 endif
 211
 212 # $(src) for including checkin headers from generated source files
 213 # $(obj) for including generated headers from checkin source files
 214 ifeq ($(KBUILD_EXTMOD),)
 215 ifdef 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))
 219 endif
 220 endif
 221
 222 # If $(is-kernel-object) is 'y', this object will be linked to vmlinux or modules
 223 is-kernel-object = $(or $(part-of-builtin),$(part-of-module))
 224
 225 part-of-builtin = $(if $(filter $(basename $@).o, $(real-obj-y) $(lib-y)),y)
 226 part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
 227 quiet_modtag = $(if $(part-of-module),[M],   )
 228
 229 modkern_cflags =                                          \
 230         $(if $(part-of-module),                           \
 231                 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
 232                 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags))
 233
 234 modkern_rustflags =                                              \
 235         $(if $(part-of-module),                                   \
 236                 $(KBUILD_RUSTFLAGS_MODULE) $(RUSTFLAGS_MODULE), \
 237                 $(KBUILD_RUSTFLAGS_KERNEL) $(RUSTFLAGS_KERNEL))
 238
 239 modkern_aflags = $(if $(part-of-module),                                \
 240                         $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE),       \
 241                         $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL))
 242
 243 c_flags        = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 244                  -include $(srctree)/include/linux/compiler_types.h       \
 245                  $(_c_flags) $(modkern_cflags)                           \
 246                  $(basename_flags) $(modname_flags)
 247
 248 rust_flags     = $(_rust_flags) $(modkern_rustflags) @$(objtree)/include/generated/rustc_cfg
 249
 250 a_flags        = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 251                  $(_a_flags) $(modkern_aflags)
 252
 253 cpp_flags      = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 254                  $(_cpp_flags)
 255
 256 ld_flags       = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))
 257
 258 DTC_INCLUDE    := $(srctree)/scripts/dtc/include-prefixes
 259
 260 dtc_cpp_flags  = -Wp,-MMD,$(depfile).pre.tmp -nostdinc                    \
 261                  $(addprefix -I,$(DTC_INCLUDE))                          \
 262                  -undef -D__DTS__
 263
 264 ifdef CONFIG_OBJTOOL
 265
 266 objtool := $(objtree)/tools/objtool/objtool
 267
 268 objtool-args-$(CONFIG_HAVE_JUMP_LABEL_HACK)             += --hacks=jump_label
 269 objtool-args-$(CONFIG_HAVE_NOINSTR_HACK)                += --hacks=noinstr
 270 objtool-args-$(CONFIG_MITIGATION_CALL_DEPTH_TRACKING)   += --hacks=skylake
 271 objtool-args-$(CONFIG_X86_KERNEL_IBT)                   += --ibt
 272 objtool-args-$(CONFIG_FINEIBT)                          += --cfi
 273 objtool-args-$(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL)        += --mcount
 274 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
 275 objtool-args-$(CONFIG_HAVE_OBJTOOL_NOP_MCOUNT)          += --mnop
 276 endif
 277 objtool-args-$(CONFIG_UNWINDER_ORC)                     += --orc
 278 objtool-args-$(CONFIG_MITIGATION_RETPOLINE)             += --retpoline
 279 objtool-args-$(CONFIG_MITIGATION_RETHUNK)               += --rethunk
 280 objtool-args-$(CONFIG_MITIGATION_SLS)                   += --sls
 281 objtool-args-$(CONFIG_STACK_VALIDATION)                 += --stackval
 282 objtool-args-$(CONFIG_HAVE_STATIC_CALL_INLINE)          += --static-call
 283 objtool-args-$(CONFIG_HAVE_UACCESS_VALIDATION)          += --uaccess
 284 objtool-args-$(CONFIG_GCOV_KERNEL)                      += --no-unreachable
 285 objtool-args-$(CONFIG_PREFIX_SYMBOLS)                   += --prefix=$(CONFIG_FUNCTION_PADDING_BYTES)
 286
 287 objtool-args = $(objtool-args-y)                                        \
 288         $(if $(delay-objtool), --link)                                  \
 289         $(if $(part-of-module), --module)
 290
 291 delay-objtool := $(or $(CONFIG_LTO_CLANG),$(CONFIG_X86_KERNEL_IBT))
 292
 293 cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool-args) $@)
 294 cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd)
 295
 296 endif # 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)
 301 define multi_depend
 302 $(foreach m, $1, \
 303         $(eval $m: \
 304         $(addprefix $(obj)/, $(call suffix-search, $(patsubst $(obj)/%,%,$m), $2, $3))))
 305 endef
 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.
 312 quiet_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
 332 quiet_cmd_ld = LD      $@
 333       cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@
 334
 335 # Archive
 336 # ---------------------------------------------------------------------------
 337
 338 quiet_cmd_ar = AR      $@
 339       cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs)
 340
 341 # Objcopy
 342 # ---------------------------------------------------------------------------
 343
 344 quiet_cmd_objcopy = OBJCOPY $@
 345 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
 346
 347 # Gzip
 348 # ---------------------------------------------------------------------------
 349
 350 quiet_cmd_gzip = GZIP    $@
 351       cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@
 352
 353 # DTC
 354 # ---------------------------------------------------------------------------
 355 DTC ?= $(objtree)/scripts/dtc/dtc
 356 DTC_FLAGS += \
 357         -Wno-unique_unit_address
 358
 359 # Disable noisy checks by default
 360 ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
 361 DTC_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
 366 else
 367 DTC_FLAGS += \
 368         -Wunique_unit_address_if_enabled
 369 endif
 370
 371 ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)
 372 DTC_FLAGS += -Wnode_name_chars_strict \
 373         -Wproperty_name_chars_strict \
 374         -Wunique_unit_address
 375 endif
 376
 377 DTC_FLAGS += $(DTC_FLAGS_$(target-stem))
 378
 379 # Set -@ if the target is a base DTB that overlay is applied onto
 380 DTC_FLAGS += $(if $(filter $(patsubst $(obj)/%,%,$@), $(base-dtb-y)), -@)
 381
 382 # Generate an assembly file to wrap the output of the device tree compiler
 383 quiet_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
 403 quiet_cmd_dtc = DTC     $@
 404 cmd_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
 410 quiet_cmd_fdtoverlay = DTOVL   $@
 411       cmd_fdtoverlay = $(objtree)/scripts/dtc/fdtoverlay -o $@ -i $(real-prereqs)
 412
 413 $(multi-dtb-y): FORCE
 414         $(call if_changed,fdtoverlay)
 415 $(call multi_depend, $(multi-dtb-y), .dtb, -dtbs)
 416
 417 ifneq ($(CHECK_DTBS),)
 418 DT_CHECKER ?= dt-validate
 419 DT_CHECKER_FLAGS ?= $(if $(DT_SCHEMA_FILES),-l $(DT_SCHEMA_FILES),-m)
 420 DT_BINDING_DIR := Documentation/devicetree/bindings
 421 DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.json
 422
 423 quiet_cmd_dtb = DTC_CHK $@
 424       cmd_dtb = $(cmd_dtc) ; $(DT_CHECKER) $(DT_CHECKER_FLAGS) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ || true
 425 else
 426 quiet_cmd_dtb = $(quiet_cmd_dtc)
 427       cmd_dtb = $(cmd_dtc)
 428 endif
 429
 430 $(obj)/%.dtb: $(obj)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
 431         $(call if_changed_dep,dtb)
 432
 433 $(obj)/%.dtbo: $(src)/%.dtso $(DTC) FORCE
 434         $(call if_changed_dep,dtc)
 435
 436 dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
 437
 438 # Bzip2
 439 # ---------------------------------------------------------------------------
 440
 441 # Bzip2 and LZMA do not include size in file... so we have to fake that;
 442 # append the size as a 32-bit littleendian number as gzip does.
 443 size_append = printf $(shell                                            \
 444 dec_size=0;                                                             \
 445 for F in $(real-prereqs); do                                    \
 446         fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F);  \
 447         dec_size=$$(expr $$dec_size + $$fsize);                         \
 448 done;                                                                   \
 449 printf "%08x\n" $$dec_size |                                            \
 450         sed 's/\(..\)/\1 /g' | {                                        \
 451                 read ch0 ch1 ch2 ch3;                                   \
 452                 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do                   \
 453                         printf '%s%03o' '\\' $$((0x$$ch));              \
 454                 done;                                                   \
 455         }                                                               \
 456 )
 457
 458 quiet_cmd_file_size = GEN     $@
 459       cmd_file_size = $(size_append) > $@
 460
 461 quiet_cmd_bzip2 = BZIP2   $@
 462       cmd_bzip2 = cat $(real-prereqs) | $(KBZIP2) -9 > $@
 463
 464 quiet_cmd_bzip2_with_size = BZIP2   $@
 465       cmd_bzip2_with_size = { cat $(real-prereqs) | $(KBZIP2) -9; $(size_append); } > $@
 466
 467 # Lzma
 468 # ---------------------------------------------------------------------------
 469
 470 quiet_cmd_lzma = LZMA    $@
 471       cmd_lzma = cat $(real-prereqs) | $(LZMA) -9 > $@
 472
 473 quiet_cmd_lzma_with_size = LZMA    $@
 474       cmd_lzma_with_size = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@
 475
 476 quiet_cmd_lzo = LZO     $@
 477       cmd_lzo = cat $(real-prereqs) | $(KLZOP) -9 > $@
 478
 479 quiet_cmd_lzo_with_size = LZO     $@
 480       cmd_lzo_with_size = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@
 481
 482 quiet_cmd_lz4 = LZ4     $@
 483       cmd_lz4 = cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout > $@
 484
 485 quiet_cmd_lz4_with_size = LZ4     $@
 486       cmd_lz4_with_size = { cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout; \
 487                   $(size_append); } > $@
 488
 489 # U-Boot mkimage
 490 # ---------------------------------------------------------------------------
 491
 492 MKIMAGE := $(srctree)/scripts/mkuboot.sh
 493
 494 # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
 495 # the number of overrides in arch makefiles
 496 UIMAGE_ARCH ?= $(SRCARCH)
 497 UIMAGE_COMPRESSION ?= $(or $(2),none)
 498 UIMAGE_OPTS-y ?=
 499 UIMAGE_TYPE ?= kernel
 500 UIMAGE_LOADADDR ?= arch_must_set_this
 501 UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
 502 UIMAGE_NAME ?= Linux-$(KERNELRELEASE)
 503
 504 quiet_cmd_uimage = UIMAGE  $@
 505       cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
 506                         -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
 507                         -T $(UIMAGE_TYPE) \
 508                         -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
 509                         -n '$(UIMAGE_NAME)' -d $< $@
 510
 511 # Flat Image Tree (FIT)
 512 # This allows for packaging of a kernel and all devicetrees files, using
 513 # compression.
 514 # ---------------------------------------------------------------------------
 515
 516 MAKE_FIT := $(srctree)/scripts/make_fit.py
 517
 518 # Use this to override the compression algorithm
 519 FIT_COMPRESSION ?= gzip
 520
 521 quiet_cmd_fit = FIT     $@
 522       cmd_fit = $(MAKE_FIT) -o $@ --arch $(UIMAGE_ARCH) --os linux \
 523                 --name '$(UIMAGE_NAME)' \
 524                 $(if $(findstring 1,$(KBUILD_VERBOSE)),-v) \
 525                 --compress $(FIT_COMPRESSION) -k $< @$(word 2,$^)
 526
 527 # XZ
 528 # ---------------------------------------------------------------------------
 529 # Use xzkern to compress the kernel image and xzmisc to compress other things.
 530 #
 531 # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
 532 # of the kernel decompressor. A BCJ filter is used if it is available for
 533 # the target architecture. xzkern also appends uncompressed size of the data
 534 # using size_append. The .xz format has the size information available at
 535 # the end of the file too, but it's in more complex format and it's good to
 536 # avoid changing the part of the boot code that reads the uncompressed size.
 537 # Note that the bytes added by size_append will make the xz tool think that
 538 # the file is corrupt. This is expected.
 539 #
 540 # xzmisc doesn't use size_append, so it can be used to create normal .xz
 541 # files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
 542 # big dictionary would increase the memory usage too much in the multi-call
 543 # decompression mode. A BCJ filter isn't used either.
 544 quiet_cmd_xzkern = XZKERN  $@
 545       cmd_xzkern = cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh > $@
 546
 547 quiet_cmd_xzkern_with_size = XZKERN  $@
 548       cmd_xzkern_with_size = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \
 549                      $(size_append); } > $@
 550
 551 quiet_cmd_xzmisc = XZMISC  $@
 552       cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@
 553
 554 # ZSTD
 555 # ---------------------------------------------------------------------------
 556 # Appends the uncompressed size of the data using size_append. The .zst
 557 # format has the size information available at the beginning of the file too,
 558 # but it's in a more complex format and it's good to avoid changing the part
 559 # of the boot code that reads the uncompressed size.
 560 #
 561 # Note that the bytes added by size_append will make the zstd tool think that
 562 # the file is corrupt. This is expected.
 563 #
 564 # zstd uses a maximum window size of 8 MB. zstd22 uses a maximum window size of
 565 # 128 MB. zstd22 is used for kernel compression because it is decompressed in a
 566 # single pass, so zstd doesn't need to allocate a window buffer. When streaming
 567 # decompression is used, like initramfs decompression, zstd22 should likely not
 568 # be used because it would require zstd to allocate a 128 MB buffer.
 569
 570 quiet_cmd_zstd = ZSTD    $@
 571       cmd_zstd = cat $(real-prereqs) | $(ZSTD) -19 > $@
 572
 573 quiet_cmd_zstd22 = ZSTD22  $@
 574       cmd_zstd22 = cat $(real-prereqs) | $(ZSTD) -22 --ultra > $@
 575
 576 quiet_cmd_zstd22_with_size = ZSTD22  $@
 577       cmd_zstd22_with_size = { cat $(real-prereqs) | $(ZSTD) -22 --ultra; $(size_append); } > $@
 578
 579 # ASM offsets
 580 # ---------------------------------------------------------------------------
 581
 582 # Default sed regexp - multiline due to syntax constraints
 583 #
 584 # Use [:space:] because LLVM's integrated assembler inserts <tab> around
 585 # the .ascii directive whereas GCC keeps the <space> as-is.
 586 define sed-offsets
 587         's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
 588         /^->/{s:->#\(.*\):/* \1 */:; \
 589         s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
 590         s:->::; p;}'
 591 endef
 592
 593 # Use filechk to avoid rebuilds when a header changes, but the resulting file
 594 # does not
 595 define filechk_offsets
 596          echo "#ifndef $2"; \
 597          echo "#define $2"; \
 598          echo "/*"; \
 599          echo " * DO NOT MODIFY."; \
 600          echo " *"; \
 601          echo " * This file was generated by Kbuild"; \
 602          echo " */"; \
 603          echo ""; \
 604          sed -ne $(sed-offsets) < $<; \
 605          echo ""; \
 606          echo "#endif"
 607 endef