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  += $(EXTRA_LDFLAGS)
   7 ifneq ($(always),)
   8 $(warning 'always' is deprecated. Please use 'always-y' instead)
   9 always-y   += $(always)
  10 endif
  11 ifneq ($(hostprogs-y),)
  12 $(warning 'hostprogs-y' is deprecated. Please use 'hostprogs' instead)
  13 hostprogs  += $(hostprogs-y)
  14 endif
  15 ifneq ($(hostprogs-m),)
  16 $(warning 'hostprogs-m' is deprecated. Please use 'hostprogs' instead)
  17 hostprogs  += $(hostprogs-m)
  18 endif
  19
  20 # flags that take effect in current and sub directories
  21 KBUILD_AFLAGS += $(subdir-asflags-y)
  22 KBUILD_CFLAGS += $(subdir-ccflags-y)
  23
  24 # Figure out what we need to build from the various variables
  25 # ===========================================================================
  26
  27 # When an object is listed to be built compiled-in and modular,
  28 # only build the compiled-in version
  29 obj-m := $(filter-out $(obj-y),$(obj-m))
  30
  31 # Libraries are always collected in one lib file.
  32 # Filter out objects already built-in
  33 lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
  34
  35 # Subdirectories we need to descend into
  36 subdir-ym := $(sort $(subdir-y) $(subdir-m) \
  37                         $(patsubst %/,%, $(filter %/, $(obj-y) $(obj-m))))
  38
  39 # Handle objects in subdirs:
  40 # - If we encounter foo/ in $(obj-y), replace it by foo/built-in.a and
  41 #   foo/modules.order
  42 # - If we encounter foo/ in $(obj-m), replace it by foo/modules.order
  43 #
  44 # Generate modules.order to determine modorder. Unfortunately, we don't have
  45 # information about ordering between -y and -m subdirs. Just put -y's first.
  46
  47 ifdef need-modorder
  48 obj-m := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m))
  49 else
  50 obj-m := $(filter-out %/, $(obj-m))
  51 endif
  52
  53 ifdef need-builtin
  54 obj-y           := $(patsubst %/, %/built-in.a, $(obj-y))
  55 else
  56 obj-y           := $(filter-out %/, $(obj-y))
  57 endif
  58
  59 # If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object
  60 multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))), $(m))))
  61 multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)) $($(m:.o=-))), $(m))))
  62 multi-used   := $(multi-used-y) $(multi-used-m)
  63
  64 # Replace multi-part objects by their individual parts,
  65 # including built-in.a from subdirectories
  66 real-obj-y := $(foreach m, $(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
  67 real-obj-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)) $($(m:.o=-))),$($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)),$(m)))
  68
  69 always-y += $(always-m)
  70
  71 # DTB
  72 # If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
  73 extra-y                         += $(dtb-y)
  74 extra-$(CONFIG_OF_ALL_DTBS)     += $(dtb-)
  75
  76 ifneq ($(CHECK_DTBS),)
  77 extra-y += $(patsubst %.dtb,%.dt.yaml, $(dtb-y))
  78 extra-$(CONFIG_OF_ALL_DTBS) += $(patsubst %.dtb,%.dt.yaml, $(dtb-))
  79 endif
  80
  81 # Add subdir path
  82
  83 extra-y         := $(addprefix $(obj)/,$(extra-y))
  84 always-y        := $(addprefix $(obj)/,$(always-y))
  85 targets         := $(addprefix $(obj)/,$(targets))
  86 obj-m           := $(addprefix $(obj)/,$(obj-m))
  87 lib-y           := $(addprefix $(obj)/,$(lib-y))
  88 real-obj-y      := $(addprefix $(obj)/,$(real-obj-y))
  89 real-obj-m      := $(addprefix $(obj)/,$(real-obj-m))
  90 multi-used-m    := $(addprefix $(obj)/,$(multi-used-m))
  91 subdir-ym       := $(addprefix $(obj)/,$(subdir-ym))
  92
  93 # Finds the multi-part object the current object will be linked into.
  94 # If the object belongs to two or more multi-part objects, list them all.
  95 modname-multi = $(sort $(foreach m,$(multi-used),\
  96                 $(if $(filter $*.o, $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$(m:.o=))))
  97
  98 __modname = $(if $(modname-multi),$(modname-multi),$(basetarget))
  99
 100 modname = $(subst $(space),:,$(__modname))
 101 modfile = $(addprefix $(obj)/,$(__modname))
 102
 103 # target with $(obj)/ and its suffix stripped
 104 target-stem = $(basename $(patsubst $(obj)/%,%,$@))
 105
 106 # These flags are needed for modversions and compiling, so we define them here
 107 # $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
 108 # end up in (or would, if it gets compiled in)
 109 name-fix = $(call stringify,$(subst $(comma),_,$(subst -,_,$1)))
 110 basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
 111 modname_flags  = -DKBUILD_MODNAME=$(call name-fix,$(modname))
 112 modfile_flags  = -DKBUILD_MODFILE=$(call stringify,$(modfile))
 113
 114 _c_flags       = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), \
 115                      $(filter-out $(ccflags-remove-y), \
 116                          $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(ccflags-y)) \
 117                      $(CFLAGS_$(target-stem).o))
 118 _a_flags       = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), \
 119                      $(filter-out $(asflags-remove-y), \
 120                          $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(asflags-y)) \
 121                      $(AFLAGS_$(target-stem).o))
 122 _cpp_flags     = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds)
 123
 124 #
 125 # Enable gcov profiling flags for a file, directory or for all files depending
 126 # on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
 127 # (in this order)
 128 #
 129 ifeq ($(CONFIG_GCOV_KERNEL),y)
 130 _c_flags += $(if $(patsubst n%,, \
 131                 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
 132                 $(CFLAGS_GCOV))
 133 endif
 134
 135 #
 136 # Enable address sanitizer flags for kernel except some files or directories
 137 # we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
 138 #
 139 ifeq ($(CONFIG_KASAN),y)
 140 _c_flags += $(if $(patsubst n%,, \
 141                 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
 142                 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
 143 endif
 144
 145 ifeq ($(CONFIG_UBSAN),y)
 146 _c_flags += $(if $(patsubst n%,, \
 147                 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
 148                 $(CFLAGS_UBSAN))
 149 endif
 150
 151 ifeq ($(CONFIG_KCOV),y)
 152 _c_flags += $(if $(patsubst n%,, \
 153         $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
 154         $(CFLAGS_KCOV))
 155 endif
 156
 157 #
 158 # Enable KCSAN flags except some files or directories we don't want to check
 159 # (depends on variables KCSAN_SANITIZE_obj.o, KCSAN_SANITIZE)
 160 #
 161 ifeq ($(CONFIG_KCSAN),y)
 162 _c_flags += $(if $(patsubst n%,, \
 163         $(KCSAN_SANITIZE_$(basetarget).o)$(KCSAN_SANITIZE)y), \
 164         $(CFLAGS_KCSAN))
 165 endif
 166
 167 # $(srctree)/$(src) for including checkin headers from generated source files
 168 # $(objtree)/$(obj) for including generated headers from checkin source files
 169 ifeq ($(KBUILD_EXTMOD),)
 170 ifdef building_out_of_srctree
 171 _c_flags   += -I $(srctree)/$(src) -I $(objtree)/$(obj)
 172 _a_flags   += -I $(srctree)/$(src) -I $(objtree)/$(obj)
 173 _cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
 174 endif
 175 endif
 176
 177 part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
 178 quiet_modtag = $(if $(part-of-module),[M],   )
 179
 180 modkern_cflags =                                          \
 181         $(if $(part-of-module),                           \
 182                 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
 183                 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags))
 184
 185 modkern_aflags = $(if $(part-of-module),                                \
 186                         $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE),       \
 187                         $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL))
 188
 189 c_flags        = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 190                  -include $(srctree)/include/linux/compiler_types.h       \
 191                  $(_c_flags) $(modkern_cflags)                           \
 192                  $(basename_flags) $(modname_flags)
 193
 194 a_flags        = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 195                  $(_a_flags) $(modkern_aflags)
 196
 197 cpp_flags      = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 198                  $(_cpp_flags)
 199
 200 ld_flags       = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))
 201
 202 DTC_INCLUDE    := $(srctree)/scripts/dtc/include-prefixes
 203
 204 dtc_cpp_flags  = -Wp,-MMD,$(depfile).pre.tmp -nostdinc                    \
 205                  $(addprefix -I,$(DTC_INCLUDE))                          \
 206                  -undef -D__DTS__
 207
 208 # Useful for describing the dependency of composite objects
 209 # Usage:
 210 #   $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
 211 define multi_depend
 212 $(foreach m, $(notdir $1), \
 213         $(eval $(obj)/$m: \
 214         $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
 215 endef
 216
 217 quiet_cmd_copy = COPY    $@
 218       cmd_copy = cp $< $@
 219
 220 # Shipped files
 221 # ===========================================================================
 222
 223 quiet_cmd_shipped = SHIPPED $@
 224 cmd_shipped = cat $< > $@
 225
 226 $(obj)/%: $(src)/%_shipped
 227         $(call cmd,shipped)
 228
 229 # Commands useful for building a boot image
 230 # ===========================================================================
 231 #
 232 #       Use as following:
 233 #
 234 #       target: source(s) FORCE
 235 #               $(if_changed,ld/objcopy/gzip)
 236 #
 237 #       and add target to extra-y so that we know we have to
 238 #       read in the saved command line
 239
 240 # Linking
 241 # ---------------------------------------------------------------------------
 242
 243 quiet_cmd_ld = LD      $@
 244       cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@
 245
 246 # Archive
 247 # ---------------------------------------------------------------------------
 248
 249 quiet_cmd_ar = AR      $@
 250       cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs)
 251
 252 # Objcopy
 253 # ---------------------------------------------------------------------------
 254
 255 quiet_cmd_objcopy = OBJCOPY $@
 256 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
 257
 258 # Gzip
 259 # ---------------------------------------------------------------------------
 260
 261 quiet_cmd_gzip = GZIP    $@
 262       cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@
 263
 264 # DTC
 265 # ---------------------------------------------------------------------------
 266 DTC ?= $(objtree)/scripts/dtc/dtc
 267 DTC_FLAGS += -Wno-interrupt_provider
 268
 269 # Disable noisy checks by default
 270 ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
 271 DTC_FLAGS += -Wno-unit_address_vs_reg \
 272         -Wno-unit_address_format \
 273         -Wno-avoid_unnecessary_addr_size \
 274         -Wno-alias_paths \
 275         -Wno-graph_child_address \
 276         -Wno-simple_bus_reg \
 277         -Wno-unique_unit_address \
 278         -Wno-pci_device_reg
 279 endif
 280
 281 ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)
 282 DTC_FLAGS += -Wnode_name_chars_strict \
 283         -Wproperty_name_chars_strict \
 284         -Winterrupt_provider
 285 endif
 286
 287 DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
 288
 289 # Generate an assembly file to wrap the output of the device tree compiler
 290 quiet_cmd_dt_S_dtb= DTB     $@
 291 cmd_dt_S_dtb=                                           \
 292 {                                                       \
 293         echo '\#include <asm-generic/vmlinux.lds.h>';   \
 294         echo '.section .dtb.init.rodata,"a"';           \
 295         echo '.balign STRUCT_ALIGNMENT';                \
 296         echo '.global __dtb_$(subst -,_,$(*F))_begin';  \
 297         echo '__dtb_$(subst -,_,$(*F))_begin:';         \
 298         echo '.incbin "$<" ';                           \
 299         echo '__dtb_$(subst -,_,$(*F))_end:';           \
 300         echo '.global __dtb_$(subst -,_,$(*F))_end';    \
 301         echo '.balign STRUCT_ALIGNMENT';                \
 302 } > $@
 303
 304 $(obj)/%.dtb.S: $(obj)/%.dtb FORCE
 305         $(call if_changed,dt_S_dtb)
 306
 307 quiet_cmd_dtc = DTC     $@
 308 cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
 309         $(DTC) -O $(patsubst .%,%,$(suffix $@)) -o $@ -b 0 \
 310                 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
 311                 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
 312         cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
 313
 314 $(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
 315         $(call if_changed_dep,dtc)
 316
 317 DT_CHECKER ?= dt-validate
 318 DT_BINDING_DIR := Documentation/devicetree/bindings
 319 # DT_TMP_SCHEMA may be overridden from Documentation/devicetree/bindings/Makefile
 320 DT_TMP_SCHEMA ?= $(objtree)/$(DT_BINDING_DIR)/processed-schema.yaml
 321
 322 quiet_cmd_dtb_check =   CHECK   $@
 323       cmd_dtb_check =   $(DT_CHECKER) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@
 324
 325 define rule_dtc
 326         $(call cmd_and_fixdep,dtc)
 327         $(call cmd,dtb_check)
 328 endef
 329
 330 $(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
 331         $(call if_changed_rule,dtc,yaml)
 332
 333 dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
 334
 335 # Bzip2
 336 # ---------------------------------------------------------------------------
 337
 338 # Bzip2 and LZMA do not include size in file... so we have to fake that;
 339 # append the size as a 32-bit littleendian number as gzip does.
 340 size_append = printf $(shell                                            \
 341 dec_size=0;                                                             \
 342 for F in $(real-prereqs); do                                    \
 343         fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F);  \
 344         dec_size=$$(expr $$dec_size + $$fsize);                         \
 345 done;                                                                   \
 346 printf "%08x\n" $$dec_size |                                            \
 347         sed 's/\(..\)/\1 /g' | {                                        \
 348                 read ch0 ch1 ch2 ch3;                                   \
 349                 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do                   \
 350                         printf '%s%03o' '\\' $$((0x$$ch));              \
 351                 done;                                                   \
 352         }                                                               \
 353 )
 354
 355 quiet_cmd_bzip2 = BZIP2   $@
 356       cmd_bzip2 = { cat $(real-prereqs) | $(KBZIP2) -9; $(size_append); } > $@
 357
 358 # Lzma
 359 # ---------------------------------------------------------------------------
 360
 361 quiet_cmd_lzma = LZMA    $@
 362       cmd_lzma = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@
 363
 364 quiet_cmd_lzo = LZO     $@
 365       cmd_lzo = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@
 366
 367 quiet_cmd_lz4 = LZ4     $@
 368       cmd_lz4 = { cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout; \
 369                   $(size_append); } > $@
 370
 371 # U-Boot mkimage
 372 # ---------------------------------------------------------------------------
 373
 374 MKIMAGE := $(srctree)/scripts/mkuboot.sh
 375
 376 # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
 377 # the number of overrides in arch makefiles
 378 UIMAGE_ARCH ?= $(SRCARCH)
 379 UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
 380 UIMAGE_OPTS-y ?=
 381 UIMAGE_TYPE ?= kernel
 382 UIMAGE_LOADADDR ?= arch_must_set_this
 383 UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
 384 UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
 385
 386 quiet_cmd_uimage = UIMAGE  $@
 387       cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
 388                         -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
 389                         -T $(UIMAGE_TYPE) \
 390                         -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
 391                         -n $(UIMAGE_NAME) -d $< $@
 392
 393 # XZ
 394 # ---------------------------------------------------------------------------
 395 # Use xzkern to compress the kernel image and xzmisc to compress other things.
 396 #
 397 # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
 398 # of the kernel decompressor. A BCJ filter is used if it is available for
 399 # the target architecture. xzkern also appends uncompressed size of the data
 400 # using size_append. The .xz format has the size information available at
 401 # the end of the file too, but it's in more complex format and it's good to
 402 # avoid changing the part of the boot code that reads the uncompressed size.
 403 # Note that the bytes added by size_append will make the xz tool think that
 404 # the file is corrupt. This is expected.
 405 #
 406 # xzmisc doesn't use size_append, so it can be used to create normal .xz
 407 # files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
 408 # big dictionary would increase the memory usage too much in the multi-call
 409 # decompression mode. A BCJ filter isn't used either.
 410 quiet_cmd_xzkern = XZKERN  $@
 411       cmd_xzkern = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \
 412                      $(size_append); } > $@
 413
 414 quiet_cmd_xzmisc = XZMISC  $@
 415       cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@
 416
 417 # ASM offsets
 418 # ---------------------------------------------------------------------------
 419
 420 # Default sed regexp - multiline due to syntax constraints
 421 #
 422 # Use [:space:] because LLVM's integrated assembler inserts <tab> around
 423 # the .ascii directive whereas GCC keeps the <space> as-is.
 424 define sed-offsets
 425         's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
 426         /^->/{s:->#\(.*\):/* \1 */:; \
 427         s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
 428         s:->::; p;}'
 429 endef
 430
 431 # Use filechk to avoid rebuilds when a header changes, but the resulting file
 432 # does not
 433 define filechk_offsets
 434          echo "#ifndef $2"; \
 435          echo "#define $2"; \
 436          echo "/*"; \
 437          echo " * DO NOT MODIFY."; \
 438          echo " *"; \
 439          echo " * This file was generated by Kbuild"; \
 440          echo " */"; \
 441          echo ""; \
 442          sed -ne $(sed-offsets) < $<; \
 443          echo ""; \
 444          echo "#endif"
 445 endef