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 # DTB
  74 # If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
  75 extra-y                         += $(dtb-y)
  76 extra-$(CONFIG_OF_ALL_DTBS)     += $(dtb-)
  77
  78 # Add subdir path
  79
  80 extra-y         := $(addprefix $(obj)/,$(extra-y))
  81 always          := $(addprefix $(obj)/,$(always))
  82 targets         := $(addprefix $(obj)/,$(targets))
  83 modorder        := $(addprefix $(obj)/,$(modorder))
  84 obj-y           := $(addprefix $(obj)/,$(obj-y))
  85 obj-m           := $(addprefix $(obj)/,$(obj-m))
  86 lib-y           := $(addprefix $(obj)/,$(lib-y))
  87 subdir-obj-y    := $(addprefix $(obj)/,$(subdir-obj-y))
  88 real-objs-y     := $(addprefix $(obj)/,$(real-objs-y))
  89 real-objs-m     := $(addprefix $(obj)/,$(real-objs-m))
  90 single-used-m   := $(addprefix $(obj)/,$(single-used-m))
  91 multi-used-y    := $(addprefix $(obj)/,$(multi-used-y))
  92 multi-used-m    := $(addprefix $(obj)/,$(multi-used-m))
  93 multi-objs-y    := $(addprefix $(obj)/,$(multi-objs-y))
  94 multi-objs-m    := $(addprefix $(obj)/,$(multi-objs-m))
  95 subdir-ym       := $(addprefix $(obj)/,$(subdir-ym))
  96 obj-dirs        := $(addprefix $(obj)/,$(obj-dirs))
  97
  98 # These flags are needed for modversions and compiling, so we define them here
  99 # already
 100 # $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will
 101 # end up in (or would, if it gets compiled in)
 102 # Note: Files that end up in two or more modules are compiled without the
 103 #       KBUILD_MODNAME definition. The reason is that any made-up name would
 104 #       differ in different configs.
 105 name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
 106 basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
 107 modname_flags  = $(if $(filter 1,$(words $(modname))),\
 108                  -DKBUILD_MODNAME=$(call name-fix,$(modname)))
 109
 110 orig_c_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \
 111                  $(ccflags-y) $(CFLAGS_$(basetarget).o)
 112 _c_flags       = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
 113 orig_a_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
 114                  $(asflags-y) $(AFLAGS_$(basetarget).o)
 115 _a_flags       = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags))
 116 _cpp_flags     = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
 117
 118 #
 119 # Enable gcov profiling flags for a file, directory or for all files depending
 120 # on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
 121 # (in this order)
 122 #
 123 ifeq ($(CONFIG_GCOV_KERNEL),y)
 124 _c_flags += $(if $(patsubst n%,, \
 125                 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
 126                 $(CFLAGS_GCOV))
 127 endif
 128
 129 #
 130 # Enable address sanitizer flags for kernel except some files or directories
 131 # we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
 132 #
 133 ifeq ($(CONFIG_KASAN),y)
 134 _c_flags += $(if $(patsubst n%,, \
 135                 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
 136                 $(CFLAGS_KASAN))
 137 endif
 138
 139 ifeq ($(CONFIG_UBSAN),y)
 140 _c_flags += $(if $(patsubst n%,, \
 141                 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
 142                 $(CFLAGS_UBSAN))
 143 endif
 144
 145 ifeq ($(CONFIG_KCOV),y)
 146 _c_flags += $(if $(patsubst n%,, \
 147         $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
 148         $(CFLAGS_KCOV))
 149 endif
 150
 151 # If building the kernel in a separate objtree expand all occurrences
 152 # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
 153
 154 ifeq ($(KBUILD_SRC),)
 155 __c_flags       = $(_c_flags)
 156 __a_flags       = $(_a_flags)
 157 __cpp_flags     = $(_cpp_flags)
 158 else
 159
 160 # -I$(obj) locates generated .h files
 161 # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
 162 #   and locates generated .h files
 163 # FIXME: Replace both with specific CFLAGS* statements in the makefiles
 164 __c_flags       = $(if $(obj),$(call addtree,-I$(src)) -I$(obj)) \
 165                   $(call flags,_c_flags)
 166 __a_flags       = $(call flags,_a_flags)
 167 __cpp_flags     = $(call flags,_cpp_flags)
 168 endif
 169
 170 c_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 171                  $(__c_flags) $(modkern_cflags)                           \
 172                  $(basename_flags) $(modname_flags)
 173
 174 a_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 175                  $(__a_flags) $(modkern_aflags)
 176
 177 cpp_flags      = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 178                  $(__cpp_flags)
 179
 180 ld_flags       = $(LDFLAGS) $(ldflags-y)
 181
 182 DTC_INCLUDE    := $(srctree)/scripts/dtc/include-prefixes
 183
 184 dtc_cpp_flags  = -Wp,-MD,$(depfile).pre.tmp -nostdinc                    \
 185                  $(addprefix -I,$(DTC_INCLUDE))                          \
 186                  -undef -D__DTS__
 187
 188 # Finds the multi-part object the current object will be linked into
 189 modname-multi = $(sort $(foreach m,$(multi-used),\
 190                 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
 191
 192 # Useful for describing the dependency of composite objects
 193 # Usage:
 194 #   $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
 195 define multi_depend
 196 $(foreach m, $(notdir $1), \
 197         $(eval $(obj)/$m: \
 198         $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
 199 endef
 200
 201 ifdef REGENERATE_PARSERS
 202
 203 # LEX
 204 # ---------------------------------------------------------------------------
 205 LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
 206
 207 quiet_cmd_flex = LEX     $@
 208       cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
 209
 210 .PRECIOUS: $(src)/%.lex.c_shipped
 211 $(src)/%.lex.c_shipped: $(src)/%.l
 212         $(call cmd,flex)
 213
 214 # YACC
 215 # ---------------------------------------------------------------------------
 216 YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
 217
 218 quiet_cmd_bison = YACC    $@
 219       cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
 220
 221 .PRECIOUS: $(src)/%.tab.c_shipped
 222 $(src)/%.tab.c_shipped: $(src)/%.y
 223         $(call cmd,bison)
 224
 225 quiet_cmd_bison_h = YACC    $@
 226       cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
 227
 228 .PRECIOUS: $(src)/%.tab.h_shipped
 229 $(src)/%.tab.h_shipped: $(src)/%.y
 230         $(call cmd,bison_h)
 231
 232 endif
 233
 234 # Shipped files
 235 # ===========================================================================
 236
 237 quiet_cmd_shipped = SHIPPED $@
 238 cmd_shipped = cat $< > $@
 239
 240 $(obj)/%: $(src)/%_shipped
 241         $(call cmd,shipped)
 242
 243 # Commands useful for building a boot image
 244 # ===========================================================================
 245 #
 246 #       Use as following:
 247 #
 248 #       target: source(s) FORCE
 249 #               $(if_changed,ld/objcopy/gzip)
 250 #
 251 #       and add target to extra-y so that we know we have to
 252 #       read in the saved command line
 253
 254 # Linking
 255 # ---------------------------------------------------------------------------
 256
 257 quiet_cmd_ld = LD      $@
 258 cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
 259                $(filter-out FORCE,$^) -o $@
 260
 261 # Objcopy
 262 # ---------------------------------------------------------------------------
 263
 264 quiet_cmd_objcopy = OBJCOPY $@
 265 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
 266
 267 # Gzip
 268 # ---------------------------------------------------------------------------
 269
 270 quiet_cmd_gzip = GZIP    $@
 271 cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
 272         (rm -f $@ ; false)
 273
 274 # DTC
 275 # ---------------------------------------------------------------------------
 276 DTC ?= $(objtree)/scripts/dtc/dtc
 277
 278 # Disable noisy checks by default
 279 ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
 280 DTC_FLAGS += -Wno-unit_address_vs_reg \
 281         -Wno-simple_bus_reg \
 282         -Wno-unit_address_format \
 283         -Wno-pci_bridge \
 284         -Wno-pci_device_bus_num \
 285         -Wno-pci_device_reg
 286 endif
 287
 288 ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),2)
 289 DTC_FLAGS += -Wnode_name_chars_strict \
 290         -Wproperty_name_chars_strict
 291 endif
 292
 293 DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
 294
 295 # Generate an assembly file to wrap the output of the device tree compiler
 296 quiet_cmd_dt_S_dtb= DTB     $@
 297 cmd_dt_S_dtb=                                           \
 298 (                                                       \
 299         echo '\#include <asm-generic/vmlinux.lds.h>';   \
 300         echo '.section .dtb.init.rodata,"a"';           \
 301         echo '.balign STRUCT_ALIGNMENT';                \
 302         echo '.global __dtb_$(*F)_begin';               \
 303         echo '__dtb_$(*F)_begin:';                      \
 304         echo '.incbin "$<" ';                           \
 305         echo '__dtb_$(*F)_end:';                        \
 306         echo '.global __dtb_$(*F)_end';                 \
 307         echo '.balign STRUCT_ALIGNMENT';                \
 308 ) > $@
 309
 310 $(obj)/%.dtb.S: $(obj)/%.dtb
 311         $(call cmd,dt_S_dtb)
 312
 313 quiet_cmd_dtc = DTC     $@
 314 cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
 315         $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
 316         $(DTC) -O dtb -o $@ -b 0 \
 317                 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
 318                 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
 319         cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
 320
 321 $(obj)/%.dtb: $(src)/%.dts FORCE
 322         $(call if_changed_dep,dtc)
 323
 324 dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
 325
 326 # Bzip2
 327 # ---------------------------------------------------------------------------
 328
 329 # Bzip2 and LZMA do not include size in file... so we have to fake that;
 330 # append the size as a 32-bit littleendian number as gzip does.
 331 size_append = printf $(shell                                            \
 332 dec_size=0;                                                             \
 333 for F in $1; do                                                         \
 334         fsize=$$(stat -c "%s" $$F);                                     \
 335         dec_size=$$(expr $$dec_size + $$fsize);                         \
 336 done;                                                                   \
 337 printf "%08x\n" $$dec_size |                                            \
 338         sed 's/\(..\)/\1 /g' | {                                        \
 339                 read ch0 ch1 ch2 ch3;                                   \
 340                 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do                   \
 341                         printf '%s%03o' '\\' $$((0x$$ch));              \
 342                 done;                                                   \
 343         }                                                               \
 344 )
 345
 346 quiet_cmd_bzip2 = BZIP2   $@
 347 cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
 348         bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 349         (rm -f $@ ; false)
 350
 351 # Lzma
 352 # ---------------------------------------------------------------------------
 353
 354 quiet_cmd_lzma = LZMA    $@
 355 cmd_lzma = (cat $(filter-out FORCE,$^) | \
 356         lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 357         (rm -f $@ ; false)
 358
 359 quiet_cmd_lzo = LZO     $@
 360 cmd_lzo = (cat $(filter-out FORCE,$^) | \
 361         lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 362         (rm -f $@ ; false)
 363
 364 quiet_cmd_lz4 = LZ4     $@
 365 cmd_lz4 = (cat $(filter-out FORCE,$^) | \
 366         lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 367         (rm -f $@ ; false)
 368
 369 # U-Boot mkimage
 370 # ---------------------------------------------------------------------------
 371
 372 MKIMAGE := $(srctree)/scripts/mkuboot.sh
 373
 374 # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
 375 # the number of overrides in arch makefiles
 376 UIMAGE_ARCH ?= $(SRCARCH)
 377 UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
 378 UIMAGE_OPTS-y ?=
 379 UIMAGE_TYPE ?= kernel
 380 UIMAGE_LOADADDR ?= arch_must_set_this
 381 UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
 382 UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
 383 UIMAGE_IN ?= $<
 384 UIMAGE_OUT ?= $@
 385
 386 quiet_cmd_uimage = UIMAGE  $(UIMAGE_OUT)
 387       cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
 388                         -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
 389                         -T $(UIMAGE_TYPE) \
 390                         -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
 391                         -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
 392
 393 # XZ
 394 # ---------------------------------------------------------------------------
 395 # Use xzkern to compress the kernel image and xzmisc to compress other things.
 396 #
 397 # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
 398 # of the kernel decompressor. A BCJ filter is used if it is available for
 399 # the target architecture. xzkern also appends uncompressed size of the data
 400 # using size_append. The .xz format has the size information available at
 401 # the end of the file too, but it's in more complex format and it's good to
 402 # avoid changing the part of the boot code that reads the uncompressed size.
 403 # Note that the bytes added by size_append will make the xz tool think that
 404 # the file is corrupt. This is expected.
 405 #
 406 # xzmisc doesn't use size_append, so it can be used to create normal .xz
 407 # files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
 408 # big dictionary would increase the memory usage too much in the multi-call
 409 # decompression mode. A BCJ filter isn't used either.
 410 quiet_cmd_xzkern = XZKERN  $@
 411 cmd_xzkern = (cat $(filter-out FORCE,$^) | \
 412         sh $(srctree)/scripts/xz_wrap.sh && \
 413         $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 414         (rm -f $@ ; false)
 415
 416 quiet_cmd_xzmisc = XZMISC  $@
 417 cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
 418         xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
 419         (rm -f $@ ; false)
 420
 421 # ASM offsets
 422 # ---------------------------------------------------------------------------
 423
 424 # Default sed regexp - multiline due to syntax constraints
 425 #
 426 # Use [:space:] because LLVM's integrated assembler inserts <tab> around
 427 # the .ascii directive whereas GCC keeps the <space> as-is.
 428 define sed-offsets
 429         's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
 430         /^->/{s:->#\(.*\):/* \1 */:; \
 431         s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
 432         s:->::; p;}'
 433 endef
 434
 435 # Use filechk to avoid rebuilds when a header changes, but the resulting file
 436 # does not
 437 define filechk_offsets
 438         (set -e; \
 439          echo "#ifndef $2"; \
 440          echo "#define $2"; \
 441          echo "/*"; \
 442          echo " * DO NOT MODIFY."; \
 443          echo " *"; \
 444          echo " * This file was generated by Kbuild"; \
 445          echo " */"; \
 446          echo ""; \
 447          sed -ne $(sed-offsets); \
 448          echo ""; \
 449          echo "#endif" )
 450 endef