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 # Add subdir path
  70
  71 extra-y         := $(addprefix $(obj)/,$(extra-y))
  72 always          := $(addprefix $(obj)/,$(always))
  73 targets         := $(addprefix $(obj)/,$(targets))
  74 modorder        := $(addprefix $(obj)/,$(modorder))
  75 obj-m           := $(addprefix $(obj)/,$(obj-m))
  76 lib-y           := $(addprefix $(obj)/,$(lib-y))
  77 subdir-obj-y    := $(addprefix $(obj)/,$(subdir-obj-y))
  78 real-obj-y      := $(addprefix $(obj)/,$(real-obj-y))
  79 real-obj-m      := $(addprefix $(obj)/,$(real-obj-m))
  80 single-used-m   := $(addprefix $(obj)/,$(single-used-m))
  81 multi-used-m    := $(addprefix $(obj)/,$(multi-used-m))
  82 subdir-ym       := $(addprefix $(obj)/,$(subdir-ym))
  83
  84 # Finds the multi-part object the current object will be linked into.
  85 # If the object belongs to two or more multi-part objects, all of them are
  86 # concatenated with a colon separator.
  87 modname-multi = $(subst $(space),:,$(sort $(foreach m,$(multi-used),\
  88                 $(if $(filter $*.o, $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$(m:.o=)))))
  89
  90 modname = $(if $(modname-multi),$(modname-multi),$(basetarget))
  91
  92 # These flags are needed for modversions and compiling, so we define them here
  93 # $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
  94 # end up in (or would, if it gets compiled in)
  95 name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
  96 basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
  97 modname_flags  = -DKBUILD_MODNAME=$(call name-fix,$(modname))
  98
  99 orig_c_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) \
 100                  $(ccflags-y) $(CFLAGS_$(basetarget).o)
 101 _c_flags       = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
 102 orig_a_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) \
 103                  $(asflags-y) $(AFLAGS_$(basetarget).o)
 104 _a_flags       = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags))
 105 _cpp_flags     = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
 106
 107 #
 108 # Enable gcov profiling flags for a file, directory or for all files depending
 109 # on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
 110 # (in this order)
 111 #
 112 ifeq ($(CONFIG_GCOV_KERNEL),y)
 113 _c_flags += $(if $(patsubst n%,, \
 114                 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
 115                 $(CFLAGS_GCOV))
 116 endif
 117
 118 #
 119 # Enable address sanitizer flags for kernel except some files or directories
 120 # we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
 121 #
 122 ifeq ($(CONFIG_KASAN),y)
 123 _c_flags += $(if $(patsubst n%,, \
 124                 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
 125                 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
 126 endif
 127
 128 ifeq ($(CONFIG_UBSAN),y)
 129 _c_flags += $(if $(patsubst n%,, \
 130                 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
 131                 $(CFLAGS_UBSAN))
 132 endif
 133
 134 ifeq ($(CONFIG_KCOV),y)
 135 _c_flags += $(if $(patsubst n%,, \
 136         $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
 137         $(CFLAGS_KCOV))
 138 endif
 139
 140 __c_flags       = $(_c_flags)
 141 __a_flags       = $(_a_flags)
 142 __cpp_flags     = $(_cpp_flags)
 143
 144 # If building the kernel in a separate objtree expand all occurrences
 145 # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
 146 ifeq ($(KBUILD_EXTMOD),)
 147 ifneq ($(KBUILD_SRC),)
 148
 149 # -I$(obj) locates generated .h files
 150 # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
 151 #   and locates generated .h files
 152 # FIXME: Replace both with specific CFLAGS* statements in the makefiles
 153 __c_flags       = $(if $(obj),$(call addtree,-I$(src)) -I$(obj)) \
 154                   $(call flags,_c_flags)
 155 __a_flags       = $(call flags,_a_flags)
 156 __cpp_flags     = $(call flags,_cpp_flags)
 157 endif
 158 endif
 159
 160 c_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 161                  -include $(srctree)/include/linux/compiler_types.h       \
 162                  $(__c_flags) $(modkern_cflags)                           \
 163                  $(basename_flags) $(modname_flags)
 164
 165 a_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 166                  $(__a_flags) $(modkern_aflags)
 167
 168 cpp_flags      = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 169                  $(__cpp_flags)
 170
 171 ld_flags       = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))
 172
 173 DTC_INCLUDE    := $(srctree)/scripts/dtc/include-prefixes
 174
 175 dtc_cpp_flags  = -Wp,-MD,$(depfile).pre.tmp -nostdinc                    \
 176                  $(addprefix -I,$(DTC_INCLUDE))                          \
 177                  -undef -D__DTS__
 178
 179 # Useful for describing the dependency of composite objects
 180 # Usage:
 181 #   $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
 182 define multi_depend
 183 $(foreach m, $(notdir $1), \
 184         $(eval $(obj)/$m: \
 185         $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
 186 endef
 187
 188 # LEX
 189 # ---------------------------------------------------------------------------
 190 quiet_cmd_flex = LEX     $@
 191       cmd_flex = $(LEX) -o$@ -L $<
 192
 193 $(obj)/%.lex.c: $(src)/%.l FORCE
 194         $(call if_changed,flex)
 195
 196 # YACC
 197 # ---------------------------------------------------------------------------
 198 quiet_cmd_bison = YACC    $@
 199       cmd_bison = $(YACC) -o$@ -t -l $<
 200
 201 $(obj)/%.tab.c: $(src)/%.y FORCE
 202         $(call if_changed,bison)
 203
 204 quiet_cmd_bison_h = YACC    $@
 205       cmd_bison_h = $(YACC) -o/dev/null --defines=$@ -t -l $<
 206
 207 $(obj)/%.tab.h: $(src)/%.y FORCE
 208         $(call if_changed,bison_h)
 209
 210 # Shipped files
 211 # ===========================================================================
 212
 213 quiet_cmd_shipped = SHIPPED $@
 214 cmd_shipped = cat $< > $@
 215
 216 $(obj)/%: $(src)/%_shipped
 217         $(call cmd,shipped)
 218
 219 # Commands useful for building a boot image
 220 # ===========================================================================
 221 #
 222 #       Use as following:
 223 #
 224 #       target: source(s) FORCE
 225 #               $(if_changed,ld/objcopy/gzip)
 226 #
 227 #       and add target to extra-y so that we know we have to
 228 #       read in the saved command line
 229
 230 # Linking
 231 # ---------------------------------------------------------------------------
 232
 233 quiet_cmd_ld = LD      $@
 234       cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@
 235
 236 # Archive
 237 # ---------------------------------------------------------------------------
 238
 239 quiet_cmd_ar = AR      $@
 240       cmd_ar = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(real-prereqs)
 241
 242 # Objcopy
 243 # ---------------------------------------------------------------------------
 244
 245 quiet_cmd_objcopy = OBJCOPY $@
 246 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
 247
 248 # Gzip
 249 # ---------------------------------------------------------------------------
 250
 251 quiet_cmd_gzip = GZIP    $@
 252       cmd_gzip = cat $(real-prereqs) | gzip -n -f -9 > $@
 253
 254 # DTC
 255 # ---------------------------------------------------------------------------
 256 DTC ?= $(objtree)/scripts/dtc/dtc
 257
 258 # Disable noisy checks by default
 259 ifeq ($(findstring 1,$(KBUILD_ENABLE_EXTRA_GCC_CHECKS)),)
 260 DTC_FLAGS += -Wno-unit_address_vs_reg \
 261         -Wno-unit_address_format \
 262         -Wno-avoid_unnecessary_addr_size \
 263         -Wno-alias_paths \
 264         -Wno-graph_child_address \
 265         -Wno-simple_bus_reg \
 266         -Wno-unique_unit_address \
 267         -Wno-pci_device_reg
 268 endif
 269
 270 ifneq ($(findstring 2,$(KBUILD_ENABLE_EXTRA_GCC_CHECKS)),)
 271 DTC_FLAGS += -Wnode_name_chars_strict \
 272         -Wproperty_name_chars_strict
 273 endif
 274
 275 DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
 276
 277 # Generate an assembly file to wrap the output of the device tree compiler
 278 quiet_cmd_dt_S_dtb= DTB     $@
 279 cmd_dt_S_dtb=                                           \
 280 {                                                       \
 281         echo '\#include <asm-generic/vmlinux.lds.h>';   \
 282         echo '.section .dtb.init.rodata,"a"';           \
 283         echo '.balign STRUCT_ALIGNMENT';                \
 284         echo '.global __dtb_$(subst -,_,$(*F))_begin';  \
 285         echo '__dtb_$(subst -,_,$(*F))_begin:';         \
 286         echo '.incbin "$<" ';                           \
 287         echo '__dtb_$(subst -,_,$(*F))_end:';           \
 288         echo '.global __dtb_$(subst -,_,$(*F))_end';    \
 289         echo '.balign STRUCT_ALIGNMENT';                \
 290 } > $@
 291
 292 $(obj)/%.dtb.S: $(obj)/%.dtb FORCE
 293         $(call if_changed,dt_S_dtb)
 294
 295 quiet_cmd_dtc = DTC     $@
 296 cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
 297         $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
 298         $(DTC) -O $(2) -o $@ -b 0 \
 299                 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
 300                 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
 301         cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
 302
 303 $(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
 304         $(call if_changed_dep,dtc,dtb)
 305
 306 DT_CHECKER ?= dt-validate
 307 DT_BINDING_DIR := Documentation/devicetree/bindings
 308 DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.yaml
 309
 310 quiet_cmd_dtb_check =   CHECK   $@
 311       cmd_dtb_check =   $(DT_CHECKER) -p $(DT_TMP_SCHEMA) $@ ;
 312
 313 define rule_dtc_dt_yaml
 314         $(call cmd_and_fixdep,dtc,yaml)
 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_dt_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 = $(CONFIG_SHELL) $(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