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