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