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
  12 # Figure out what we need to build from the various variables
  13 # ===========================================================================
  14
  15 # When an object is listed to be built compiled-in and modular,
  16 # only build the compiled-in version
  17 obj-m := $(filter-out $(obj-y),$(obj-m))
  18
  19 # Libraries are always collected in one lib file.
  20 # Filter out objects already built-in
  21 lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
  22
  23 # Determine modorder.
  24 # Unfortunately, we don't have information about ordering between -y
  25 # and -m subdirs.  Just put -y's first.
  26 modorder        := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
  27
  28 # Handle objects in subdirs
  29 # ---------------------------------------------------------------------------
  30 # o if we encounter foo/ in $(obj-y), replace it by foo/built-in.a
  31 #   and add the directory to the list of dirs to descend into: $(subdir-y)
  32 # o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
  33 #   and add the directory to the list of dirs to descend into: $(subdir-m)
  34 __subdir-y      := $(patsubst %/,%,$(filter %/, $(obj-y)))
  35 subdir-y        += $(__subdir-y)
  36 __subdir-m      := $(patsubst %/,%,$(filter %/, $(obj-m)))
  37 subdir-m        += $(__subdir-m)
  38 obj-y           := $(patsubst %/, %/built-in.a, $(obj-y))
  39 obj-m           := $(filter-out %/, $(obj-m))
  40
  41 # Subdirectories we need to descend into
  42 subdir-ym       := $(sort $(subdir-y) $(subdir-m))
  43
  44 # if $(foo-objs), $(foo-y), or $(foo-m) exists, foo.o is a composite object
  45 multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
  46 multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))), $(m))))
  47 multi-used   := $(multi-used-y) $(multi-used-m)
  48
  49 # $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
  50 # tell kbuild to descend
  51 subdir-obj-y := $(filter %/built-in.a, $(obj-y))
  52
  53 # Replace multi-part objects by their individual parts,
  54 # including built-in.a from subdirectories
  55 real-obj-y := $(foreach m, $(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
  56 real-obj-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)),$(m)))
  57
  58 # DTB
  59 # If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
  60 extra-y                         += $(dtb-y)
  61 extra-$(CONFIG_OF_ALL_DTBS)     += $(dtb-)
  62
  63 ifneq ($(CHECK_DTBS),)
  64 extra-y += $(patsubst %.dtb,%.dt.yaml, $(dtb-y))
  65 extra-$(CONFIG_OF_ALL_DTBS) += $(patsubst %.dtb,%.dt.yaml, $(dtb-))
  66 endif
  67
  68 # Test self-contained headers
  69
  70 # Wildcard searches in $(srctree)/$(src)/, but not in $(objtree)/$(obj)/.
  71 # Stale generated headers are often left over, so pattern matching should
  72 # be avoided. Please notice $(srctree)/$(src)/ and $(objtree)/$(obj) point
  73 # to the same location for in-tree building. So, header-test-pattern-y should
  74 # be used with care.
  75 header-test-y   += $(filter-out $(header-test-), \
  76                 $(patsubst $(srctree)/$(src)/%, %, \
  77                 $(wildcard $(addprefix $(srctree)/$(src)/, \
  78                 $(header-test-pattern-y)))))
  79
  80 extra-$(CONFIG_HEADER_TEST) += $(addsuffix .s, $(header-test-y) $(header-test-m))
  81
  82 # Add subdir path
  83
  84 extra-y         := $(addprefix $(obj)/,$(extra-y))
  85 always          := $(addprefix $(obj)/,$(always))
  86 targets         := $(addprefix $(obj)/,$(targets))
  87 modorder        := $(addprefix $(obj)/,$(modorder))
  88 obj-m           := $(addprefix $(obj)/,$(obj-m))
  89 lib-y           := $(addprefix $(obj)/,$(lib-y))
  90 subdir-obj-y    := $(addprefix $(obj)/,$(subdir-obj-y))
  91 real-obj-y      := $(addprefix $(obj)/,$(real-obj-y))
  92 real-obj-m      := $(addprefix $(obj)/,$(real-obj-m))
  93 multi-used-m    := $(addprefix $(obj)/,$(multi-used-m))
  94 subdir-ym       := $(addprefix $(obj)/,$(subdir-ym))
  95
  96 # Finds the multi-part object the current object will be linked into.
  97 # If the object belongs to two or more multi-part objects, all of them are
  98 # concatenated with a colon separator.
  99 modname-multi = $(subst $(space),:,$(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 # These flags are needed for modversions and compiling, so we define them here
 105 # $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
 106 # end up in (or would, if it gets compiled in)
 107 name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
 108 basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
 109 modname_flags  = -DKBUILD_MODNAME=$(call name-fix,$(modname))
 110
 111 orig_c_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) \
 112                  $(ccflags-y) $(CFLAGS_$(basetarget).o)
 113 _c_flags       = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
 114 orig_a_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) \
 115                  $(asflags-y) $(AFLAGS_$(basetarget).o)
 116 _a_flags       = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags))
 117 _cpp_flags     = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
 118
 119 #
 120 # Enable gcov profiling flags for a file, directory or for all files depending
 121 # on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
 122 # (in this order)
 123 #
 124 ifeq ($(CONFIG_GCOV_KERNEL),y)
 125 _c_flags += $(if $(patsubst n%,, \
 126                 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
 127                 $(CFLAGS_GCOV))
 128 endif
 129
 130 #
 131 # Enable address sanitizer flags for kernel except some files or directories
 132 # we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
 133 #
 134 ifeq ($(CONFIG_KASAN),y)
 135 _c_flags += $(if $(patsubst n%,, \
 136                 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
 137                 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
 138 endif
 139
 140 ifeq ($(CONFIG_UBSAN),y)
 141 _c_flags += $(if $(patsubst n%,, \
 142                 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
 143                 $(CFLAGS_UBSAN))
 144 endif
 145
 146 ifeq ($(CONFIG_KCOV),y)
 147 _c_flags += $(if $(patsubst n%,, \
 148         $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
 149         $(CFLAGS_KCOV))
 150 endif
 151
 152 # $(srctree)/$(src) for including checkin headers from generated source files
 153 # $(objtree)/$(obj) for including generated headers from checkin source files
 154 ifeq ($(KBUILD_EXTMOD),)
 155 ifdef building_out_of_srctree
 156 _c_flags   += -I $(srctree)/$(src) -I $(objtree)/$(obj)
 157 _a_flags   += -I $(srctree)/$(src) -I $(objtree)/$(obj)
 158 _cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
 159 endif
 160 endif
 161
 162 c_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 163                  -include $(srctree)/include/linux/compiler_types.h       \
 164                  $(_c_flags) $(modkern_cflags)                           \
 165                  $(basename_flags) $(modname_flags)
 166
 167 a_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 168                  $(_a_flags) $(modkern_aflags)
 169
 170 cpp_flags      = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 171                  $(_cpp_flags)
 172
 173 ld_flags       = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))
 174
 175 DTC_INCLUDE    := $(srctree)/scripts/dtc/include-prefixes
 176
 177 dtc_cpp_flags  = -Wp,-MD,$(depfile).pre.tmp -nostdinc                    \
 178                  $(addprefix -I,$(DTC_INCLUDE))                          \
 179                  -undef -D__DTS__
 180
 181 # Useful for describing the dependency of composite objects
 182 # Usage:
 183 #   $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
 184 define multi_depend
 185 $(foreach m, $(notdir $1), \
 186         $(eval $(obj)/$m: \
 187         $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
 188 endef
 189
 190 # LEX
 191 # ---------------------------------------------------------------------------
 192 quiet_cmd_flex = LEX     $@
 193       cmd_flex = $(LEX) -o$@ -L $<
 194
 195 $(obj)/%.lex.c: $(src)/%.l FORCE
 196         $(call if_changed,flex)
 197
 198 # YACC
 199 # ---------------------------------------------------------------------------
 200 quiet_cmd_bison = YACC    $@
 201       cmd_bison = $(YACC) -o$@ -t -l $<
 202
 203 $(obj)/%.tab.c: $(src)/%.y FORCE
 204         $(call if_changed,bison)
 205
 206 quiet_cmd_bison_h = YACC    $@
 207       cmd_bison_h = $(YACC) -o/dev/null --defines=$@ -t -l $<
 208
 209 $(obj)/%.tab.h: $(src)/%.y FORCE
 210         $(call if_changed,bison_h)
 211
 212 # Shipped files
 213 # ===========================================================================
 214
 215 quiet_cmd_shipped = SHIPPED $@
 216 cmd_shipped = cat $< > $@
 217
 218 $(obj)/%: $(src)/%_shipped
 219         $(call cmd,shipped)
 220
 221 # Commands useful for building a boot image
 222 # ===========================================================================
 223 #
 224 #       Use as following:
 225 #
 226 #       target: source(s) FORCE
 227 #               $(if_changed,ld/objcopy/gzip)
 228 #
 229 #       and add target to extra-y so that we know we have to
 230 #       read in the saved command line
 231
 232 # Linking
 233 # ---------------------------------------------------------------------------
 234
 235 quiet_cmd_ld = LD      $@
 236       cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@
 237
 238 # Archive
 239 # ---------------------------------------------------------------------------
 240
 241 quiet_cmd_ar = AR      $@
 242       cmd_ar = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(real-prereqs)
 243
 244 # Objcopy
 245 # ---------------------------------------------------------------------------
 246
 247 quiet_cmd_objcopy = OBJCOPY $@
 248 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
 249
 250 # Gzip
 251 # ---------------------------------------------------------------------------
 252
 253 quiet_cmd_gzip = GZIP    $@
 254       cmd_gzip = cat $(real-prereqs) | gzip -n -f -9 > $@
 255
 256 # DTC
 257 # ---------------------------------------------------------------------------
 258 DTC ?= $(objtree)/scripts/dtc/dtc
 259
 260 # Disable noisy checks by default
 261 ifeq ($(findstring 1,$(KBUILD_ENABLE_EXTRA_GCC_CHECKS)),)
 262 DTC_FLAGS += -Wno-unit_address_vs_reg \
 263         -Wno-unit_address_format \
 264         -Wno-avoid_unnecessary_addr_size \
 265         -Wno-alias_paths \
 266         -Wno-graph_child_address \
 267         -Wno-simple_bus_reg \
 268         -Wno-unique_unit_address \
 269         -Wno-pci_device_reg
 270 endif
 271
 272 ifneq ($(findstring 2,$(KBUILD_ENABLE_EXTRA_GCC_CHECKS)),)
 273 DTC_FLAGS += -Wnode_name_chars_strict \
 274         -Wproperty_name_chars_strict
 275 endif
 276
 277 DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
 278
 279 # Generate an assembly file to wrap the output of the device tree compiler
 280 quiet_cmd_dt_S_dtb= DTB     $@
 281 cmd_dt_S_dtb=                                           \
 282 {                                                       \
 283         echo '\#include <asm-generic/vmlinux.lds.h>';   \
 284         echo '.section .dtb.init.rodata,"a"';           \
 285         echo '.balign STRUCT_ALIGNMENT';                \
 286         echo '.global __dtb_$(subst -,_,$(*F))_begin';  \
 287         echo '__dtb_$(subst -,_,$(*F))_begin:';         \
 288         echo '.incbin "$<" ';                           \
 289         echo '__dtb_$(subst -,_,$(*F))_end:';           \
 290         echo '.global __dtb_$(subst -,_,$(*F))_end';    \
 291         echo '.balign STRUCT_ALIGNMENT';                \
 292 } > $@
 293
 294 $(obj)/%.dtb.S: $(obj)/%.dtb FORCE
 295         $(call if_changed,dt_S_dtb)
 296
 297 quiet_cmd_dtc = DTC     $@
 298 cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
 299         $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
 300         $(DTC) -O $(2) -o $@ -b 0 \
 301                 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
 302                 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
 303         cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
 304
 305 $(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
 306         $(call if_changed_dep,dtc,dtb)
 307
 308 DT_CHECKER ?= dt-validate
 309 DT_BINDING_DIR := Documentation/devicetree/bindings
 310 DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.yaml
 311
 312 quiet_cmd_dtb_check =   CHECK   $@
 313       cmd_dtb_check =   $(DT_CHECKER) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ ;
 314
 315 define rule_dtc_dt_yaml
 316         $(call cmd_and_fixdep,dtc,yaml)
 317         $(call cmd,dtb_check)
 318 endef
 319
 320 $(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
 321         $(call if_changed_rule,dtc_dt_yaml)
 322
 323 dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
 324
 325 # Bzip2
 326 # ---------------------------------------------------------------------------
 327
 328 # Bzip2 and LZMA do not include size in file... so we have to fake that;
 329 # append the size as a 32-bit littleendian number as gzip does.
 330 size_append = printf $(shell                                            \
 331 dec_size=0;                                                             \
 332 for F in $(real-prereqs); do                                    \
 333         fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F);  \
 334         dec_size=$$(expr $$dec_size + $$fsize);                         \
 335 done;                                                                   \
 336 printf "%08x\n" $$dec_size |                                            \
 337         sed 's/\(..\)/\1 /g' | {                                        \
 338                 read ch0 ch1 ch2 ch3;                                   \
 339                 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do                   \
 340                         printf '%s%03o' '\\' $$((0x$$ch));              \
 341                 done;                                                   \
 342         }                                                               \
 343 )
 344
 345 quiet_cmd_bzip2 = BZIP2   $@
 346       cmd_bzip2 = { cat $(real-prereqs) | bzip2 -9; $(size_append); } > $@
 347
 348 # Lzma
 349 # ---------------------------------------------------------------------------
 350
 351 quiet_cmd_lzma = LZMA    $@
 352       cmd_lzma = { cat $(real-prereqs) | lzma -9; $(size_append); } > $@
 353
 354 quiet_cmd_lzo = LZO     $@
 355       cmd_lzo = { cat $(real-prereqs) | lzop -9; $(size_append); } > $@
 356
 357 quiet_cmd_lz4 = LZ4     $@
 358       cmd_lz4 = { cat $(real-prereqs) | lz4c -l -c1 stdin stdout; \
 359                   $(size_append); } > $@
 360
 361 # U-Boot mkimage
 362 # ---------------------------------------------------------------------------
 363
 364 MKIMAGE := $(srctree)/scripts/mkuboot.sh
 365
 366 # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
 367 # the number of overrides in arch makefiles
 368 UIMAGE_ARCH ?= $(SRCARCH)
 369 UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
 370 UIMAGE_OPTS-y ?=
 371 UIMAGE_TYPE ?= kernel
 372 UIMAGE_LOADADDR ?= arch_must_set_this
 373 UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
 374 UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
 375
 376 quiet_cmd_uimage = UIMAGE  $@
 377       cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
 378                         -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
 379                         -T $(UIMAGE_TYPE) \
 380                         -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
 381                         -n $(UIMAGE_NAME) -d $< $@
 382
 383 # XZ
 384 # ---------------------------------------------------------------------------
 385 # Use xzkern to compress the kernel image and xzmisc to compress other things.
 386 #
 387 # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
 388 # of the kernel decompressor. A BCJ filter is used if it is available for
 389 # the target architecture. xzkern also appends uncompressed size of the data
 390 # using size_append. The .xz format has the size information available at
 391 # the end of the file too, but it's in more complex format and it's good to
 392 # avoid changing the part of the boot code that reads the uncompressed size.
 393 # Note that the bytes added by size_append will make the xz tool think that
 394 # the file is corrupt. This is expected.
 395 #
 396 # xzmisc doesn't use size_append, so it can be used to create normal .xz
 397 # files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
 398 # big dictionary would increase the memory usage too much in the multi-call
 399 # decompression mode. A BCJ filter isn't used either.
 400 quiet_cmd_xzkern = XZKERN  $@
 401       cmd_xzkern = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \
 402                      $(size_append); } > $@
 403
 404 quiet_cmd_xzmisc = XZMISC  $@
 405       cmd_xzmisc = cat $(real-prereqs) | xz --check=crc32 --lzma2=dict=1MiB > $@
 406
 407 # ASM offsets
 408 # ---------------------------------------------------------------------------
 409
 410 # Default sed regexp - multiline due to syntax constraints
 411 #
 412 # Use [:space:] because LLVM's integrated assembler inserts <tab> around
 413 # the .ascii directive whereas GCC keeps the <space> as-is.
 414 define sed-offsets
 415         's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
 416         /^->/{s:->#\(.*\):/* \1 */:; \
 417         s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
 418         s:->::; p;}'
 419 endef
 420
 421 # Use filechk to avoid rebuilds when a header changes, but the resulting file
 422 # does not
 423 define filechk_offsets
 424          echo "#ifndef $2"; \
 425          echo "#define $2"; \
 426          echo "/*"; \
 427          echo " * DO NOT MODIFY."; \
 428          echo " *"; \
 429          echo " * This file was generated by Kbuild"; \
 430          echo " */"; \
 431          echo ""; \
 432          sed -ne $(sed-offsets) < $<; \
 433          echo ""; \
 434          echo "#endif"
 435 endef