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 # Add subdir path
  65
  66 extra-y         := $(addprefix $(obj)/,$(extra-y))
  67 always          := $(addprefix $(obj)/,$(always))
  68 targets         := $(addprefix $(obj)/,$(targets))
  69 modorder        := $(addprefix $(obj)/,$(modorder))
  70 obj-m           := $(addprefix $(obj)/,$(obj-m))
  71 lib-y           := $(addprefix $(obj)/,$(lib-y))
  72 subdir-obj-y    := $(addprefix $(obj)/,$(subdir-obj-y))
  73 real-obj-y      := $(addprefix $(obj)/,$(real-obj-y))
  74 real-obj-m      := $(addprefix $(obj)/,$(real-obj-m))
  75 single-used-m   := $(addprefix $(obj)/,$(single-used-m))
  76 multi-used-m    := $(addprefix $(obj)/,$(multi-used-m))
  77 subdir-ym       := $(addprefix $(obj)/,$(subdir-ym))
  78
  79 # Finds the multi-part object the current object will be linked into.
  80 # If the object belongs to two or more multi-part objects, all of them are
  81 # concatenated with a colon separator.
  82 modname-multi = $(subst $(space),:,$(sort $(foreach m,$(multi-used),\
  83                 $(if $(filter $*.o, $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$(m:.o=)))))
  84
  85 modname = $(if $(modname-multi),$(modname-multi),$(basetarget))
  86
  87 # These flags are needed for modversions and compiling, so we define them here
  88 # $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
  89 # end up in (or would, if it gets compiled in)
  90 name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
  91 basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
  92 modname_flags  = -DKBUILD_MODNAME=$(call name-fix,$(modname))
  93
  94 orig_c_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) \
  95                  $(ccflags-y) $(CFLAGS_$(basetarget).o)
  96 _c_flags       = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
  97 orig_a_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) \
  98                  $(asflags-y) $(AFLAGS_$(basetarget).o)
  99 _a_flags       = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags))
 100 _cpp_flags     = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
 101
 102 #
 103 # Enable gcov profiling flags for a file, directory or for all files depending
 104 # on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
 105 # (in this order)
 106 #
 107 ifeq ($(CONFIG_GCOV_KERNEL),y)
 108 _c_flags += $(if $(patsubst n%,, \
 109                 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
 110                 $(CFLAGS_GCOV))
 111 endif
 112
 113 #
 114 # Enable address sanitizer flags for kernel except some files or directories
 115 # we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
 116 #
 117 ifeq ($(CONFIG_KASAN),y)
 118 _c_flags += $(if $(patsubst n%,, \
 119                 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
 120                 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
 121 endif
 122
 123 ifeq ($(CONFIG_UBSAN),y)
 124 _c_flags += $(if $(patsubst n%,, \
 125                 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
 126                 $(CFLAGS_UBSAN))
 127 endif
 128
 129 ifeq ($(CONFIG_KCOV),y)
 130 _c_flags += $(if $(patsubst n%,, \
 131         $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
 132         $(CFLAGS_KCOV))
 133 endif
 134
 135 # If building the kernel in a separate objtree expand all occurrences
 136 # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
 137
 138 ifeq ($(KBUILD_SRC),)
 139 __c_flags       = $(_c_flags)
 140 __a_flags       = $(_a_flags)
 141 __cpp_flags     = $(_cpp_flags)
 142 else
 143
 144 # -I$(obj) locates generated .h files
 145 # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
 146 #   and locates generated .h files
 147 # FIXME: Replace both with specific CFLAGS* statements in the makefiles
 148 __c_flags       = $(if $(obj),$(call addtree,-I$(src)) -I$(obj)) \
 149                   $(call flags,_c_flags)
 150 __a_flags       = $(call flags,_a_flags)
 151 __cpp_flags     = $(call flags,_cpp_flags)
 152 endif
 153
 154 c_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 155                  -include $(srctree)/include/linux/compiler_types.h       \
 156                  $(__c_flags) $(modkern_cflags)                           \
 157                  $(basename_flags) $(modname_flags)
 158
 159 a_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 160                  $(__a_flags) $(modkern_aflags)
 161
 162 cpp_flags      = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 163                  $(__cpp_flags)
 164
 165 ld_flags       = $(LDFLAGS) $(ldflags-y)
 166
 167 DTC_INCLUDE    := $(srctree)/scripts/dtc/include-prefixes
 168
 169 dtc_cpp_flags  = -Wp,-MD,$(depfile).pre.tmp -nostdinc                    \
 170                  $(addprefix -I,$(DTC_INCLUDE))                          \
 171                  -undef -D__DTS__
 172
 173 # Useful for describing the dependency of composite objects
 174 # Usage:
 175 #   $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
 176 define multi_depend
 177 $(foreach m, $(notdir $1), \
 178         $(eval $(obj)/$m: \
 179         $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
 180 endef
 181
 182 # LEX
 183 # ---------------------------------------------------------------------------
 184 quiet_cmd_flex = LEX     $@
 185       cmd_flex = $(LEX) -o$@ -L $<
 186
 187 $(obj)/%.lex.c: $(src)/%.l FORCE
 188         $(call if_changed,flex)
 189
 190 # YACC
 191 # ---------------------------------------------------------------------------
 192 quiet_cmd_bison = YACC    $@
 193       cmd_bison = $(YACC) -o$@ -t -l $<
 194
 195 $(obj)/%.tab.c: $(src)/%.y FORCE
 196         $(call if_changed,bison)
 197
 198 quiet_cmd_bison_h = YACC    $@
 199       cmd_bison_h = $(YACC) -o/dev/null --defines=$@ -t -l $<
 200
 201 $(obj)/%.tab.h: $(src)/%.y FORCE
 202         $(call if_changed,bison_h)
 203
 204 # Shipped files
 205 # ===========================================================================
 206
 207 quiet_cmd_shipped = SHIPPED $@
 208 cmd_shipped = cat $< > $@
 209
 210 $(obj)/%: $(src)/%_shipped
 211         $(call cmd,shipped)
 212
 213 # Commands useful for building a boot image
 214 # ===========================================================================
 215 #
 216 #       Use as following:
 217 #
 218 #       target: source(s) FORCE
 219 #               $(if_changed,ld/objcopy/gzip)
 220 #
 221 #       and add target to extra-y so that we know we have to
 222 #       read in the saved command line
 223
 224 # Linking
 225 # ---------------------------------------------------------------------------
 226
 227 quiet_cmd_ld = LD      $@
 228 cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
 229                $(filter-out FORCE,$^) -o $@
 230
 231 # Objcopy
 232 # ---------------------------------------------------------------------------
 233
 234 quiet_cmd_objcopy = OBJCOPY $@
 235 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
 236
 237 # Gzip
 238 # ---------------------------------------------------------------------------
 239
 240 quiet_cmd_gzip = GZIP    $@
 241 cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
 242         (rm -f $@ ; false)
 243
 244 # DTC
 245 # ---------------------------------------------------------------------------
 246 DTC ?= $(objtree)/scripts/dtc/dtc
 247
 248 # Disable noisy checks by default
 249 ifeq ($(findstring 1,$(KBUILD_ENABLE_EXTRA_GCC_CHECKS)),)
 250 DTC_FLAGS += -Wno-unit_address_vs_reg \
 251         -Wno-unit_address_format \
 252         -Wno-avoid_unnecessary_addr_size \
 253         -Wno-alias_paths \
 254         -Wno-graph_child_address \
 255         -Wno-graph_port \
 256         -Wno-unique_unit_address \
 257         -Wno-pci_device_reg
 258 endif
 259
 260 ifneq ($(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         $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
 288         $(DTC) -O dtb -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)
 295
 296 dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
 297
 298 # Bzip2
 299 # ---------------------------------------------------------------------------
 300
 301 # Bzip2 and LZMA do not include size in file... so we have to fake that;
 302 # append the size as a 32-bit littleendian number as gzip does.
 303 size_append = printf $(shell                                            \
 304 dec_size=0;                                                             \
 305 for F in $1; do                                                         \
 306         fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F);  \
 307         dec_size=$$(expr $$dec_size + $$fsize);                         \
 308 done;                                                                   \
 309 printf "%08x\n" $$dec_size |                                            \
 310         sed 's/\(..\)/\1 /g' | {                                        \
 311                 read ch0 ch1 ch2 ch3;                                   \
 312                 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do                   \
 313                         printf '%s%03o' '\\' $$((0x$$ch));              \
 314                 done;                                                   \
 315         }                                                               \
 316 )
 317
 318 quiet_cmd_bzip2 = BZIP2   $@
 319 cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
 320         bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 321         (rm -f $@ ; false)
 322
 323 # Lzma
 324 # ---------------------------------------------------------------------------
 325
 326 quiet_cmd_lzma = LZMA    $@
 327 cmd_lzma = (cat $(filter-out FORCE,$^) | \
 328         lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 329         (rm -f $@ ; false)
 330
 331 quiet_cmd_lzo = LZO     $@
 332 cmd_lzo = (cat $(filter-out FORCE,$^) | \
 333         lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 334         (rm -f $@ ; false)
 335
 336 quiet_cmd_lz4 = LZ4     $@
 337 cmd_lz4 = (cat $(filter-out FORCE,$^) | \
 338         lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 339         (rm -f $@ ; false)
 340
 341 # U-Boot mkimage
 342 # ---------------------------------------------------------------------------
 343
 344 MKIMAGE := $(srctree)/scripts/mkuboot.sh
 345
 346 # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
 347 # the number of overrides in arch makefiles
 348 UIMAGE_ARCH ?= $(SRCARCH)
 349 UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
 350 UIMAGE_OPTS-y ?=
 351 UIMAGE_TYPE ?= kernel
 352 UIMAGE_LOADADDR ?= arch_must_set_this
 353 UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
 354 UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
 355 UIMAGE_IN ?= $<
 356 UIMAGE_OUT ?= $@
 357
 358 quiet_cmd_uimage = UIMAGE  $(UIMAGE_OUT)
 359       cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
 360                         -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
 361                         -T $(UIMAGE_TYPE) \
 362                         -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
 363                         -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
 364
 365 # XZ
 366 # ---------------------------------------------------------------------------
 367 # Use xzkern to compress the kernel image and xzmisc to compress other things.
 368 #
 369 # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
 370 # of the kernel decompressor. A BCJ filter is used if it is available for
 371 # the target architecture. xzkern also appends uncompressed size of the data
 372 # using size_append. The .xz format has the size information available at
 373 # the end of the file too, but it's in more complex format and it's good to
 374 # avoid changing the part of the boot code that reads the uncompressed size.
 375 # Note that the bytes added by size_append will make the xz tool think that
 376 # the file is corrupt. This is expected.
 377 #
 378 # xzmisc doesn't use size_append, so it can be used to create normal .xz
 379 # files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
 380 # big dictionary would increase the memory usage too much in the multi-call
 381 # decompression mode. A BCJ filter isn't used either.
 382 quiet_cmd_xzkern = XZKERN  $@
 383 cmd_xzkern = (cat $(filter-out FORCE,$^) | \
 384         sh $(srctree)/scripts/xz_wrap.sh && \
 385         $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 386         (rm -f $@ ; false)
 387
 388 quiet_cmd_xzmisc = XZMISC  $@
 389 cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
 390         xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
 391         (rm -f $@ ; false)
 392
 393 # ASM offsets
 394 # ---------------------------------------------------------------------------
 395
 396 # Default sed regexp - multiline due to syntax constraints
 397 #
 398 # Use [:space:] because LLVM's integrated assembler inserts <tab> around
 399 # the .ascii directive whereas GCC keeps the <space> as-is.
 400 define sed-offsets
 401         's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
 402         /^->/{s:->#\(.*\):/* \1 */:; \
 403         s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
 404         s:->::; p;}'
 405 endef
 406
 407 # Use filechk to avoid rebuilds when a header changes, but the resulting file
 408 # does not
 409 define filechk_offsets
 410         (set -e; \
 411          echo "#ifndef $2"; \
 412          echo "#define $2"; \
 413          echo "/*"; \
 414          echo " * DO NOT MODIFY."; \
 415          echo " *"; \
 416          echo " * This file was generated by Kbuild"; \
 417          echo " */"; \
 418          echo ""; \
 419          sed -ne $(sed-offsets); \
 420          echo ""; \
 421          echo "#endif" )
 422 endef