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 # Determine modorder.
  36 # Unfortunately, we don't have information about ordering between -y
  37 # and -m subdirs.  Just put -y's first.
  38 ifdef need-modorder
  39 modorder        := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
  40 endif
  41
  42 # Handle objects in subdirs
  43 # ---------------------------------------------------------------------------
  44 # o if we encounter foo/ in $(obj-y), replace it by foo/built-in.a
  45 #   and add the directory to the list of dirs to descend into: $(subdir-y)
  46 # o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
  47 #   and add the directory to the list of dirs to descend into: $(subdir-m)
  48 __subdir-y      := $(patsubst %/,%,$(filter %/, $(obj-y)))
  49 subdir-y        += $(__subdir-y)
  50 __subdir-m      := $(patsubst %/,%,$(filter %/, $(obj-m)))
  51 subdir-m        += $(__subdir-m)
  52 ifdef need-builtin
  53 obj-y           := $(patsubst %/, %/built-in.a, $(obj-y))
  54 else
  55 obj-y           := $(filter-out %/, $(obj-y))
  56 endif
  57 obj-m           := $(filter-out %/, $(obj-m))
  58
  59 # Subdirectories we need to descend into
  60 subdir-ym       := $(sort $(subdir-y) $(subdir-m))
  61
  62 # If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object
  63 multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))), $(m))))
  64 multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)) $($(m:.o=-))), $(m))))
  65 multi-used   := $(multi-used-y) $(multi-used-m)
  66
  67 # Replace multi-part objects by their individual parts,
  68 # including built-in.a from subdirectories
  69 real-obj-y := $(foreach m, $(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
  70 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)))
  71
  72 always-y += $(always-m)
  73
  74 # DTB
  75 # If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
  76 extra-y                         += $(dtb-y)
  77 extra-$(CONFIG_OF_ALL_DTBS)     += $(dtb-)
  78
  79 ifneq ($(CHECK_DTBS),)
  80 extra-y += $(patsubst %.dtb,%.dt.yaml, $(dtb-y))
  81 extra-$(CONFIG_OF_ALL_DTBS) += $(patsubst %.dtb,%.dt.yaml, $(dtb-))
  82 endif
  83
  84 # Add subdir path
  85
  86 extra-y         := $(addprefix $(obj)/,$(extra-y))
  87 always-y        := $(addprefix $(obj)/,$(always-y))
  88 targets         := $(addprefix $(obj)/,$(targets))
  89 modorder        := $(addprefix $(obj)/,$(modorder))
  90 obj-m           := $(addprefix $(obj)/,$(obj-m))
  91 lib-y           := $(addprefix $(obj)/,$(lib-y))
  92 real-obj-y      := $(addprefix $(obj)/,$(real-obj-y))
  93 real-obj-m      := $(addprefix $(obj)/,$(real-obj-m))
  94 multi-used-m    := $(addprefix $(obj)/,$(multi-used-m))
  95 subdir-ym       := $(addprefix $(obj)/,$(subdir-ym))
  96
  97 # Finds the multi-part object the current object will be linked into.
  98 # If the object belongs to two or more multi-part objects, list them all.
  99 modname-multi = $(sort $(foreach m,$(multi-used),\
 100                 $(if $(filter $*.o, $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$(m:.o=))))
 101
 102 __modname = $(if $(modname-multi),$(modname-multi),$(basetarget))
 103
 104 modname = $(subst $(space),:,$(__modname))
 105 modfile = $(addprefix $(obj)/,$(__modname))
 106
 107 # target with $(obj)/ and its suffix stripped
 108 target-stem = $(basename $(patsubst $(obj)/%,%,$@))
 109
 110 # These flags are needed for modversions and compiling, so we define them here
 111 # $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
 112 # end up in (or would, if it gets compiled in)
 113 name-fix = $(call stringify,$(subst $(comma),_,$(subst -,_,$1)))
 114 basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
 115 modname_flags  = -DKBUILD_MODNAME=$(call name-fix,$(modname))
 116 modfile_flags  = -DKBUILD_MODFILE=$(call stringify,$(modfile))
 117
 118 orig_c_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) \
 119                  $(ccflags-y) $(CFLAGS_$(target-stem).o)
 120 _c_flags       = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), $(orig_c_flags))
 121 orig_a_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) \
 122                  $(asflags-y) $(AFLAGS_$(target-stem).o)
 123 _a_flags       = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), $(orig_a_flags))
 124 _cpp_flags     = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds)
 125
 126 #
 127 # Enable gcov profiling flags for a file, directory or for all files depending
 128 # on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
 129 # (in this order)
 130 #
 131 ifeq ($(CONFIG_GCOV_KERNEL),y)
 132 _c_flags += $(if $(patsubst n%,, \
 133                 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
 134                 $(CFLAGS_GCOV))
 135 endif
 136
 137 #
 138 # Enable address sanitizer flags for kernel except some files or directories
 139 # we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
 140 #
 141 ifeq ($(CONFIG_KASAN),y)
 142 _c_flags += $(if $(patsubst n%,, \
 143                 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
 144                 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
 145 endif
 146
 147 ifeq ($(CONFIG_UBSAN),y)
 148 _c_flags += $(if $(patsubst n%,, \
 149                 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
 150                 $(CFLAGS_UBSAN))
 151 endif
 152
 153 ifeq ($(CONFIG_KCOV),y)
 154 _c_flags += $(if $(patsubst n%,, \
 155         $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
 156         $(CFLAGS_KCOV))
 157 endif
 158
 159 # $(srctree)/$(src) for including checkin headers from generated source files
 160 # $(objtree)/$(obj) for including generated headers from checkin source files
 161 ifeq ($(KBUILD_EXTMOD),)
 162 ifdef building_out_of_srctree
 163 _c_flags   += -I $(srctree)/$(src) -I $(objtree)/$(obj)
 164 _a_flags   += -I $(srctree)/$(src) -I $(objtree)/$(obj)
 165 _cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
 166 endif
 167 endif
 168
 169 part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
 170 quiet_modtag = $(if $(part-of-module),[M],   )
 171
 172 modkern_cflags =                                          \
 173         $(if $(part-of-module),                           \
 174                 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
 175                 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags))
 176
 177 modkern_aflags = $(if $(part-of-module),                                \
 178                         $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE),       \
 179                         $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL))
 180
 181 c_flags        = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 182                  -include $(srctree)/include/linux/compiler_types.h       \
 183                  $(_c_flags) $(modkern_cflags)                           \
 184                  $(basename_flags) $(modname_flags)
 185
 186 a_flags        = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 187                  $(_a_flags) $(modkern_aflags)
 188
 189 cpp_flags      = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 190                  $(_cpp_flags)
 191
 192 ld_flags       = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))
 193
 194 DTC_INCLUDE    := $(srctree)/scripts/dtc/include-prefixes
 195
 196 dtc_cpp_flags  = -Wp,-MMD,$(depfile).pre.tmp -nostdinc                    \
 197                  $(addprefix -I,$(DTC_INCLUDE))                          \
 198                  -undef -D__DTS__
 199
 200 # Useful for describing the dependency of composite objects
 201 # Usage:
 202 #   $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
 203 define multi_depend
 204 $(foreach m, $(notdir $1), \
 205         $(eval $(obj)/$m: \
 206         $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
 207 endef
 208
 209 # Shipped files
 210 # ===========================================================================
 211
 212 quiet_cmd_shipped = SHIPPED $@
 213 cmd_shipped = cat $< > $@
 214
 215 $(obj)/%: $(src)/%_shipped
 216         $(call cmd,shipped)
 217
 218 # Commands useful for building a boot image
 219 # ===========================================================================
 220 #
 221 #       Use as following:
 222 #
 223 #       target: source(s) FORCE
 224 #               $(if_changed,ld/objcopy/gzip)
 225 #
 226 #       and add target to extra-y so that we know we have to
 227 #       read in the saved command line
 228
 229 # Linking
 230 # ---------------------------------------------------------------------------
 231
 232 quiet_cmd_ld = LD      $@
 233       cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@
 234
 235 # Archive
 236 # ---------------------------------------------------------------------------
 237
 238 quiet_cmd_ar = AR      $@
 239       cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs)
 240
 241 # Objcopy
 242 # ---------------------------------------------------------------------------
 243
 244 quiet_cmd_objcopy = OBJCOPY $@
 245 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
 246
 247 # Gzip
 248 # ---------------------------------------------------------------------------
 249
 250 quiet_cmd_gzip = GZIP    $@
 251       cmd_gzip = cat $(real-prereqs) | gzip -n -f -9 > $@
 252
 253 # DTC
 254 # ---------------------------------------------------------------------------
 255 DTC ?= $(objtree)/scripts/dtc/dtc
 256
 257 # Disable noisy checks by default
 258 ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
 259 DTC_FLAGS += -Wno-unit_address_vs_reg \
 260         -Wno-unit_address_format \
 261         -Wno-avoid_unnecessary_addr_size \
 262         -Wno-alias_paths \
 263         -Wno-graph_child_address \
 264         -Wno-simple_bus_reg \
 265         -Wno-unique_unit_address \
 266         -Wno-pci_device_reg
 267 endif
 268
 269 ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)
 270 DTC_FLAGS += -Wnode_name_chars_strict \
 271         -Wproperty_name_chars_strict
 272 endif
 273
 274 DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
 275
 276 # Generate an assembly file to wrap the output of the device tree compiler
 277 quiet_cmd_dt_S_dtb= DTB     $@
 278 cmd_dt_S_dtb=                                           \
 279 {                                                       \
 280         echo '\#include <asm-generic/vmlinux.lds.h>';   \
 281         echo '.section .dtb.init.rodata,"a"';           \
 282         echo '.balign STRUCT_ALIGNMENT';                \
 283         echo '.global __dtb_$(subst -,_,$(*F))_begin';  \
 284         echo '__dtb_$(subst -,_,$(*F))_begin:';         \
 285         echo '.incbin "$<" ';                           \
 286         echo '__dtb_$(subst -,_,$(*F))_end:';           \
 287         echo '.global __dtb_$(subst -,_,$(*F))_end';    \
 288         echo '.balign STRUCT_ALIGNMENT';                \
 289 } > $@
 290
 291 $(obj)/%.dtb.S: $(obj)/%.dtb FORCE
 292         $(call if_changed,dt_S_dtb)
 293
 294 quiet_cmd_dtc = DTC     $@
 295 cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
 296         $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
 297         $(DTC) -O $(patsubst .%,%,$(suffix $@)) -o $@ -b 0 \
 298                 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
 299                 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
 300         cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
 301
 302 $(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
 303         $(call if_changed_dep,dtc)
 304
 305 DT_CHECKER ?= dt-validate
 306 DT_BINDING_DIR := Documentation/devicetree/bindings
 307 # DT_TMP_SCHEMA may be overridden from Documentation/devicetree/bindings/Makefile
 308 DT_TMP_SCHEMA ?= $(objtree)/$(DT_BINDING_DIR)/processed-schema.yaml
 309
 310 quiet_cmd_dtb_check =   CHECK   $@
 311       cmd_dtb_check =   $(DT_CHECKER) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@
 312
 313 define rule_dtc
 314         $(call cmd_and_fixdep,dtc)
 315         $(call cmd,dtb_check)
 316 endef
 317
 318 $(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
 319         $(call if_changed_rule,dtc,yaml)
 320
 321 dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
 322
 323 # Bzip2
 324 # ---------------------------------------------------------------------------
 325
 326 # Bzip2 and LZMA do not include size in file... so we have to fake that;
 327 # append the size as a 32-bit littleendian number as gzip does.
 328 size_append = printf $(shell                                            \
 329 dec_size=0;                                                             \
 330 for F in $(real-prereqs); do                                    \
 331         fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F);  \
 332         dec_size=$$(expr $$dec_size + $$fsize);                         \
 333 done;                                                                   \
 334 printf "%08x\n" $$dec_size |                                            \
 335         sed 's/\(..\)/\1 /g' | {                                        \
 336                 read ch0 ch1 ch2 ch3;                                   \
 337                 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do                   \
 338                         printf '%s%03o' '\\' $$((0x$$ch));              \
 339                 done;                                                   \
 340         }                                                               \
 341 )
 342
 343 quiet_cmd_bzip2 = BZIP2   $@
 344       cmd_bzip2 = { cat $(real-prereqs) | bzip2 -9; $(size_append); } > $@
 345
 346 # Lzma
 347 # ---------------------------------------------------------------------------
 348
 349 quiet_cmd_lzma = LZMA    $@
 350       cmd_lzma = { cat $(real-prereqs) | lzma -9; $(size_append); } > $@
 351
 352 quiet_cmd_lzo = LZO     $@
 353       cmd_lzo = { cat $(real-prereqs) | lzop -9; $(size_append); } > $@
 354
 355 quiet_cmd_lz4 = LZ4     $@
 356       cmd_lz4 = { cat $(real-prereqs) | lz4c -l -c1 stdin stdout; \
 357                   $(size_append); } > $@
 358
 359 # U-Boot mkimage
 360 # ---------------------------------------------------------------------------
 361
 362 MKIMAGE := $(srctree)/scripts/mkuboot.sh
 363
 364 # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
 365 # the number of overrides in arch makefiles
 366 UIMAGE_ARCH ?= $(SRCARCH)
 367 UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
 368 UIMAGE_OPTS-y ?=
 369 UIMAGE_TYPE ?= kernel
 370 UIMAGE_LOADADDR ?= arch_must_set_this
 371 UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
 372 UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
 373
 374 quiet_cmd_uimage = UIMAGE  $@
 375       cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
 376                         -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
 377                         -T $(UIMAGE_TYPE) \
 378                         -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
 379                         -n $(UIMAGE_NAME) -d $< $@
 380
 381 # XZ
 382 # ---------------------------------------------------------------------------
 383 # Use xzkern to compress the kernel image and xzmisc to compress other things.
 384 #
 385 # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
 386 # of the kernel decompressor. A BCJ filter is used if it is available for
 387 # the target architecture. xzkern also appends uncompressed size of the data
 388 # using size_append. The .xz format has the size information available at
 389 # the end of the file too, but it's in more complex format and it's good to
 390 # avoid changing the part of the boot code that reads the uncompressed size.
 391 # Note that the bytes added by size_append will make the xz tool think that
 392 # the file is corrupt. This is expected.
 393 #
 394 # xzmisc doesn't use size_append, so it can be used to create normal .xz
 395 # files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
 396 # big dictionary would increase the memory usage too much in the multi-call
 397 # decompression mode. A BCJ filter isn't used either.
 398 quiet_cmd_xzkern = XZKERN  $@
 399       cmd_xzkern = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \
 400                      $(size_append); } > $@
 401
 402 quiet_cmd_xzmisc = XZMISC  $@
 403       cmd_xzmisc = cat $(real-prereqs) | xz --check=crc32 --lzma2=dict=1MiB > $@
 404
 405 # ASM offsets
 406 # ---------------------------------------------------------------------------
 407
 408 # Default sed regexp - multiline due to syntax constraints
 409 #
 410 # Use [:space:] because LLVM's integrated assembler inserts <tab> around
 411 # the .ascii directive whereas GCC keeps the <space> as-is.
 412 define sed-offsets
 413         's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
 414         /^->/{s:->#\(.*\):/* \1 */:; \
 415         s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
 416         s:->::; p;}'
 417 endef
 418
 419 # Use filechk to avoid rebuilds when a header changes, but the resulting file
 420 # does not
 421 define filechk_offsets
 422          echo "#ifndef $2"; \
 423          echo "#define $2"; \
 424          echo "/*"; \
 425          echo " * DO NOT MODIFY."; \
 426          echo " *"; \
 427          echo " * This file was generated by Kbuild"; \
 428          echo " */"; \
 429          echo ""; \
 430          sed -ne $(sed-offsets) < $<; \
 431          echo ""; \
 432          echo "#endif"
 433 endef