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