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