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 #
   9 # flags that take effect in sub directories
  10 export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y)
  11 export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(subdir-ccflags-y)
  12
  13 # Figure out what we need to build from the various variables
  14 # ===========================================================================
  15
  16 # When an object is listed to be built compiled-in and modular,
  17 # only build the compiled-in version
  18
  19 obj-m := $(filter-out $(obj-y),$(obj-m))
  20
  21 # Libraries are always collected in one lib file.
  22 # Filter out objects already built-in
  23
  24 lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
  25
  26
  27 # Handle objects in subdirs
  28 # ---------------------------------------------------------------------------
  29 # o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
  30 #   and add the directory to the list of dirs to descend into: $(subdir-y)
  31 # o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
  32 #   and add the directory to the list of dirs to descend into: $(subdir-m)
  33
  34 # Determine modorder.
  35 # Unfortunately, we don't have information about ordering between -y
  36 # and -m subdirs.  Just put -y's first.
  37 modorder        := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
  38
  39 __subdir-y      := $(patsubst %/,%,$(filter %/, $(obj-y)))
  40 subdir-y        += $(__subdir-y)
  41 __subdir-m      := $(patsubst %/,%,$(filter %/, $(obj-m)))
  42 subdir-m        += $(__subdir-m)
  43 obj-y           := $(patsubst %/, %/built-in.o, $(obj-y))
  44 obj-m           := $(filter-out %/, $(obj-m))
  45
  46 # Subdirectories we need to descend into
  47
  48 subdir-ym       := $(sort $(subdir-y) $(subdir-m))
  49
  50 # if $(foo-objs) exists, foo.o is a composite object
  51 multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
  52 multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))), $(m))))
  53 multi-used   := $(multi-used-y) $(multi-used-m)
  54 single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
  55
  56 # Build list of the parts of our composite objects, our composite
  57 # objects depend on those (obviously)
  58 multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
  59 multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
  60 multi-objs   := $(multi-objs-y) $(multi-objs-m)
  61
  62 # $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
  63 # tell kbuild to descend
  64 subdir-obj-y := $(filter %/built-in.o, $(obj-y))
  65
  66 # $(obj-dirs) is a list of directories that contain object files
  67 obj-dirs := $(dir $(multi-objs) $(obj-y))
  68
  69 # Replace multi-part objects by their individual parts, look at local dir only
  70 real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) $(extra-y)
  71 real-objs-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)))
  72
  73 # Add subdir path
  74
  75 extra-y         := $(addprefix $(obj)/,$(extra-y))
  76 always          := $(addprefix $(obj)/,$(always))
  77 targets         := $(addprefix $(obj)/,$(targets))
  78 modorder        := $(addprefix $(obj)/,$(modorder))
  79 obj-y           := $(addprefix $(obj)/,$(obj-y))
  80 obj-m           := $(addprefix $(obj)/,$(obj-m))
  81 lib-y           := $(addprefix $(obj)/,$(lib-y))
  82 subdir-obj-y    := $(addprefix $(obj)/,$(subdir-obj-y))
  83 real-objs-y     := $(addprefix $(obj)/,$(real-objs-y))
  84 real-objs-m     := $(addprefix $(obj)/,$(real-objs-m))
  85 single-used-m   := $(addprefix $(obj)/,$(single-used-m))
  86 multi-used-y    := $(addprefix $(obj)/,$(multi-used-y))
  87 multi-used-m    := $(addprefix $(obj)/,$(multi-used-m))
  88 multi-objs-y    := $(addprefix $(obj)/,$(multi-objs-y))
  89 multi-objs-m    := $(addprefix $(obj)/,$(multi-objs-m))
  90 subdir-ym       := $(addprefix $(obj)/,$(subdir-ym))
  91 obj-dirs        := $(addprefix $(obj)/,$(obj-dirs))
  92
  93 # These flags are needed for modversions and compiling, so we define them here
  94 # already
  95 # $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will
  96 # end up in (or would, if it gets compiled in)
  97 # Note: Files that end up in two or more modules are compiled without the
  98 #       KBUILD_MODNAME definition. The reason is that any made-up name would
  99 #       differ in different configs.
 100 name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
 101 basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
 102 modname_flags  = $(if $(filter 1,$(words $(modname))),\
 103                  -DKBUILD_MODNAME=$(call name-fix,$(modname)))
 104
 105 orig_c_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \
 106                  $(ccflags-y) $(CFLAGS_$(basetarget).o)
 107 _c_flags       = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
 108 orig_a_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
 109                  $(asflags-y) $(AFLAGS_$(basetarget).o)
 110 _a_flags       = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags))
 111 _cpp_flags     = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
 112
 113 #
 114 # Enable gcov profiling flags for a file, directory or for all files depending
 115 # on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
 116 # (in this order)
 117 #
 118 ifeq ($(CONFIG_GCOV_KERNEL),y)
 119 _c_flags += $(if $(patsubst n%,, \
 120                 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
 121                 $(CFLAGS_GCOV))
 122 endif
 123
 124 #
 125 # Enable address sanitizer flags for kernel except some files or directories
 126 # we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
 127 #
 128 ifeq ($(CONFIG_KASAN),y)
 129 _c_flags += $(if $(patsubst n%,, \
 130                 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
 131                 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
 132 endif
 133
 134 ifeq ($(CONFIG_UBSAN),y)
 135 _c_flags += $(if $(patsubst n%,, \
 136                 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
 137                 $(CFLAGS_UBSAN))
 138 endif
 139
 140 ifeq ($(CONFIG_KCOV),y)
 141 _c_flags += $(if $(patsubst n%,, \
 142         $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
 143         $(CFLAGS_KCOV))
 144 endif
 145
 146 # If building the kernel in a separate objtree expand all occurrences
 147 # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
 148
 149 ifeq ($(KBUILD_SRC),)
 150 __c_flags       = $(_c_flags)
 151 __a_flags       = $(_a_flags)
 152 __cpp_flags     = $(_cpp_flags)
 153 else
 154
 155 # -I$(obj) locates generated .h files
 156 # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
 157 #   and locates generated .h files
 158 # FIXME: Replace both with specific CFLAGS* statements in the makefiles
 159 __c_flags       = $(if $(obj),$(call addtree,-I$(src)) -I$(obj)) \
 160                   $(call flags,_c_flags)
 161 __a_flags       = $(call flags,_a_flags)
 162 __cpp_flags     = $(call flags,_cpp_flags)
 163 endif
 164
 165 c_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 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       = $(LDFLAGS) $(ldflags-y)
 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 # Finds the multi-part object the current object will be linked into
 184 modname-multi = $(sort $(foreach m,$(multi-used),\
 185                 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
 186
 187 # Useful for describing the dependency of composite objects
 188 # Usage:
 189 #   $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
 190 define multi_depend
 191 $(foreach m, $(notdir $1), \
 192         $(eval $(obj)/$m: \
 193         $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
 194 endef
 195
 196 ifdef REGENERATE_PARSERS
 197
 198 # LEX
 199 # ---------------------------------------------------------------------------
 200 LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
 201
 202 quiet_cmd_flex = LEX     $@
 203       cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
 204
 205 .PRECIOUS: $(src)/%.lex.c_shipped
 206 $(src)/%.lex.c_shipped: $(src)/%.l
 207         $(call cmd,flex)
 208
 209 # YACC
 210 # ---------------------------------------------------------------------------
 211 YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
 212
 213 quiet_cmd_bison = YACC    $@
 214       cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
 215
 216 .PRECIOUS: $(src)/%.tab.c_shipped
 217 $(src)/%.tab.c_shipped: $(src)/%.y
 218         $(call cmd,bison)
 219
 220 quiet_cmd_bison_h = YACC    $@
 221       cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
 222
 223 .PRECIOUS: $(src)/%.tab.h_shipped
 224 $(src)/%.tab.h_shipped: $(src)/%.y
 225         $(call cmd,bison_h)
 226
 227 endif
 228
 229 # Shipped files
 230 # ===========================================================================
 231
 232 quiet_cmd_shipped = SHIPPED $@
 233 cmd_shipped = cat $< > $@
 234
 235 $(obj)/%: $(src)/%_shipped
 236         $(call cmd,shipped)
 237
 238 # Commands useful for building a boot image
 239 # ===========================================================================
 240 #
 241 #       Use as following:
 242 #
 243 #       target: source(s) FORCE
 244 #               $(if_changed,ld/objcopy/gzip)
 245 #
 246 #       and add target to extra-y so that we know we have to
 247 #       read in the saved command line
 248
 249 # Linking
 250 # ---------------------------------------------------------------------------
 251
 252 quiet_cmd_ld = LD      $@
 253 cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
 254                $(filter-out FORCE,$^) -o $@
 255
 256 # Objcopy
 257 # ---------------------------------------------------------------------------
 258
 259 quiet_cmd_objcopy = OBJCOPY $@
 260 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
 261
 262 # Gzip
 263 # ---------------------------------------------------------------------------
 264
 265 quiet_cmd_gzip = GZIP    $@
 266 cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
 267         (rm -f $@ ; false)
 268
 269 # DTC
 270 # ---------------------------------------------------------------------------
 271 DTC ?= $(objtree)/scripts/dtc/dtc
 272
 273 # Overlay support
 274 DTC_FLAGS += -@
 275
 276 # Disable noisy checks by default
 277 ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
 278 DTC_FLAGS += -Wno-unit_address_vs_reg
 279 endif
 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
 297         $(call cmd,dt_S_dtb)
 298
 299 quiet_cmd_dtc = DTC     $@
 300 cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
 301         $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
 302         $(DTC) -O dtb -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 FORCE
 308         $(call if_changed_dep,dtc)
 309
 310 $(obj)/%.dtbo: $(src)/%.dts FORCE
 311         $(call if_changed_dep,dtc)
 312
 313 dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
 314
 315 # cat
 316 # ---------------------------------------------------------------------------
 317 # Concatentate multiple files together
 318 quiet_cmd_cat = CAT     $@
 319 cmd_cat = (cat $(filter-out FORCE,$^) > $@) || (rm -f $@; false)
 320
 321 # Bzip2
 322 # ---------------------------------------------------------------------------
 323
 324 # Bzip2 and LZMA do not include size in file... so we have to fake that;
 325 # append the size as a 32-bit littleendian number as gzip does.
 326 size_append = printf $(shell                                            \
 327 dec_size=0;                                                             \
 328 for F in $1; do                                                         \
 329         fsize=$$(stat -c "%s" $$F);                                     \
 330         dec_size=$$(expr $$dec_size + $$fsize);                         \
 331 done;                                                                   \
 332 printf "%08x\n" $$dec_size |                                            \
 333         sed 's/\(..\)/\1 /g' | {                                        \
 334                 read ch0 ch1 ch2 ch3;                                   \
 335                 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do                   \
 336                         printf '%s%03o' '\\' $$((0x$$ch));              \
 337                 done;                                                   \
 338         }                                                               \
 339 )
 340
 341 quiet_cmd_bzip2 = BZIP2   $@
 342 cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
 343         bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 344         (rm -f $@ ; false)
 345
 346 # Lzma
 347 # ---------------------------------------------------------------------------
 348
 349 quiet_cmd_lzma = LZMA    $@
 350 cmd_lzma = (cat $(filter-out FORCE,$^) | \
 351         lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 352         (rm -f $@ ; false)
 353
 354 quiet_cmd_lzo = LZO     $@
 355 cmd_lzo = (cat $(filter-out FORCE,$^) | \
 356         lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 357         (rm -f $@ ; false)
 358
 359 quiet_cmd_lz4 = LZ4     $@
 360 cmd_lz4 = (cat $(filter-out FORCE,$^) | \
 361         lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 362         (rm -f $@ ; false)
 363
 364 # U-Boot mkimage
 365 # ---------------------------------------------------------------------------
 366
 367 MKIMAGE := $(srctree)/scripts/mkuboot.sh
 368
 369 # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
 370 # the number of overrides in arch makefiles
 371 UIMAGE_ARCH ?= $(SRCARCH)
 372 UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
 373 UIMAGE_OPTS-y ?=
 374 UIMAGE_TYPE ?= kernel
 375 UIMAGE_LOADADDR ?= arch_must_set_this
 376 UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
 377 UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
 378 UIMAGE_IN ?= $<
 379 UIMAGE_OUT ?= $@
 380
 381 quiet_cmd_uimage = UIMAGE  $(UIMAGE_OUT)
 382       cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
 383                         -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
 384                         -T $(UIMAGE_TYPE) \
 385                         -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
 386                         -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
 387
 388 # XZ
 389 # ---------------------------------------------------------------------------
 390 # Use xzkern to compress the kernel image and xzmisc to compress other things.
 391 #
 392 # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
 393 # of the kernel decompressor. A BCJ filter is used if it is available for
 394 # the target architecture. xzkern also appends uncompressed size of the data
 395 # using size_append. The .xz format has the size information available at
 396 # the end of the file too, but it's in more complex format and it's good to
 397 # avoid changing the part of the boot code that reads the uncompressed size.
 398 # Note that the bytes added by size_append will make the xz tool think that
 399 # the file is corrupt. This is expected.
 400 #
 401 # xzmisc doesn't use size_append, so it can be used to create normal .xz
 402 # files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
 403 # big dictionary would increase the memory usage too much in the multi-call
 404 # decompression mode. A BCJ filter isn't used either.
 405 quiet_cmd_xzkern = XZKERN  $@
 406 cmd_xzkern = (cat $(filter-out FORCE,$^) | \
 407         sh $(srctree)/scripts/xz_wrap.sh && \
 408         $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 409         (rm -f $@ ; false)
 410
 411 quiet_cmd_xzmisc = XZMISC  $@
 412 cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
 413         xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
 414         (rm -f $@ ; false)
 415
 416 # ASM offsets
 417 # ---------------------------------------------------------------------------
 418
 419 # Default sed regexp - multiline due to syntax constraints
 420 #
 421 # Use [:space:] because LLVM's integrated assembler inserts <tab> around
 422 # the .ascii directive whereas GCC keeps the <space> as-is.
 423 define sed-offsets
 424         's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
 425         /^->/{s:->#\(.*\):/* \1 */:; \
 426         s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
 427         s:->::; p;}'
 428 endef
 429
 430 # Use filechk to avoid rebuilds when a header changes, but the resulting file
 431 # does not
 432 define filechk_offsets
 433         (set -e; \
 434          echo "#ifndef $2"; \
 435          echo "#define $2"; \
 436          echo "/*"; \
 437          echo " * DO NOT MODIFY."; \
 438          echo " *"; \
 439          echo " * This file was generated by Kbuild"; \
 440          echo " */"; \
 441          echo ""; \
 442          sed -ne $(sed-offsets); \
 443          echo ""; \
 444          echo "#endif" )
 445 endef