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