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 always-y   += $(always)
   8 hostprogs  += $(hostprogs-y) $(hostprogs-m)
   9
  10 # flags that take effect in current and sub directories
  11 KBUILD_AFLAGS += $(subdir-asflags-y)
  12 KBUILD_CFLAGS += $(subdir-ccflags-y)
  13
  14 # Figure out what we need to build from the various variables
  15 # ===========================================================================
  16
  17 # When an object is listed to be built compiled-in and modular,
  18 # only build the compiled-in version
  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 lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
  24
  25 # Determine modorder.
  26 # Unfortunately, we don't have information about ordering between -y
  27 # and -m subdirs.  Just put -y's first.
  28 modorder        := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
  29
  30 # Handle objects in subdirs
  31 # ---------------------------------------------------------------------------
  32 # o if we encounter foo/ in $(obj-y), replace it by foo/built-in.a
  33 #   and add the directory to the list of dirs to descend into: $(subdir-y)
  34 # o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
  35 #   and add the directory to the list of dirs to descend into: $(subdir-m)
  36 __subdir-y      := $(patsubst %/,%,$(filter %/, $(obj-y)))
  37 subdir-y        += $(__subdir-y)
  38 __subdir-m      := $(patsubst %/,%,$(filter %/, $(obj-m)))
  39 subdir-m        += $(__subdir-m)
  40 ifdef need-builtin
  41 obj-y           := $(patsubst %/, %/built-in.a, $(obj-y))
  42 else
  43 obj-y           := $(filter-out %/, $(obj-y))
  44 endif
  45 obj-m           := $(filter-out %/, $(obj-m))
  46
  47 # Subdirectories we need to descend into
  48 subdir-ym       := $(sort $(subdir-y) $(subdir-m))
  49
  50 # If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) 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:.o=-))), $(m))))
  52 multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)) $($(m:.o=-))), $(m))))
  53 multi-used   := $(multi-used-y) $(multi-used-m)
  54
  55 # $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
  56 # tell kbuild to descend
  57 subdir-obj-y := $(filter %/built-in.a, $(obj-y))
  58
  59 # Replace multi-part objects by their individual parts,
  60 # including built-in.a from subdirectories
  61 real-obj-y := $(foreach m, $(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
  62 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)))
  63
  64 always-y += $(always-m)
  65
  66 # DTB
  67 # If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
  68 extra-y                         += $(dtb-y)
  69 extra-$(CONFIG_OF_ALL_DTBS)     += $(dtb-)
  70
  71 ifneq ($(CHECK_DTBS),)
  72 extra-y += $(patsubst %.dtb,%.dt.yaml, $(dtb-y))
  73 extra-$(CONFIG_OF_ALL_DTBS) += $(patsubst %.dtb,%.dt.yaml, $(dtb-))
  74 endif
  75
  76 # Add subdir path
  77
  78 extra-y         := $(addprefix $(obj)/,$(extra-y))
  79 always-y        := $(addprefix $(obj)/,$(always-y))
  80 targets         := $(addprefix $(obj)/,$(targets))
  81 modorder        := $(addprefix $(obj)/,$(modorder))
  82 obj-m           := $(addprefix $(obj)/,$(obj-m))
  83 lib-y           := $(addprefix $(obj)/,$(lib-y))
  84 subdir-obj-y    := $(addprefix $(obj)/,$(subdir-obj-y))
  85 real-obj-y      := $(addprefix $(obj)/,$(real-obj-y))
  86 real-obj-m      := $(addprefix $(obj)/,$(real-obj-m))
  87 multi-used-m    := $(addprefix $(obj)/,$(multi-used-m))
  88 subdir-ym       := $(addprefix $(obj)/,$(subdir-ym))
  89
  90 # Finds the multi-part object the current object will be linked into.
  91 # If the object belongs to two or more multi-part objects, list them all.
  92 modname-multi = $(sort $(foreach m,$(multi-used),\
  93                 $(if $(filter $*.o, $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$(m:.o=))))
  94
  95 __modname = $(if $(modname-multi),$(modname-multi),$(basetarget))
  96
  97 modname = $(subst $(space),:,$(__modname))
  98 modfile = $(addprefix $(obj)/,$(__modname))
  99
 100 # target with $(obj)/ and its suffix stripped
 101 target-stem = $(basename $(patsubst $(obj)/%,%,$@))
 102
 103 # These flags are needed for modversions and compiling, so we define them here
 104 # $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
 105 # end up in (or would, if it gets compiled in)
 106 name-fix = $(call stringify,$(subst $(comma),_,$(subst -,_,$1)))
 107 basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
 108 modname_flags  = -DKBUILD_MODNAME=$(call name-fix,$(modname))
 109 modfile_flags  = -DKBUILD_MODFILE=$(call stringify,$(modfile))
 110
 111 orig_c_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) \
 112                  $(ccflags-y) $(CFLAGS_$(target-stem).o)
 113 _c_flags       = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), $(orig_c_flags))
 114 orig_a_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) \
 115                  $(asflags-y) $(AFLAGS_$(target-stem).o)
 116 _a_flags       = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), $(orig_a_flags))
 117 _cpp_flags     = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds)
 118
 119 #
 120 # Enable gcov profiling flags for a file, directory or for all files depending
 121 # on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
 122 # (in this order)
 123 #
 124 ifeq ($(CONFIG_GCOV_KERNEL),y)
 125 _c_flags += $(if $(patsubst n%,, \
 126                 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
 127                 $(CFLAGS_GCOV))
 128 endif
 129
 130 #
 131 # Enable address sanitizer flags for kernel except some files or directories
 132 # we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
 133 #
 134 ifeq ($(CONFIG_KASAN),y)
 135 _c_flags += $(if $(patsubst n%,, \
 136                 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
 137                 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
 138 endif
 139
 140 ifeq ($(CONFIG_UBSAN),y)
 141 _c_flags += $(if $(patsubst n%,, \
 142                 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
 143                 $(CFLAGS_UBSAN))
 144 endif
 145
 146 ifeq ($(CONFIG_KCOV),y)
 147 _c_flags += $(if $(patsubst n%,, \
 148         $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
 149         $(CFLAGS_KCOV))
 150 endif
 151
 152 # $(srctree)/$(src) for including checkin headers from generated source files
 153 # $(objtree)/$(obj) for including generated headers from checkin source files
 154 ifeq ($(KBUILD_EXTMOD),)
 155 ifdef building_out_of_srctree
 156 _c_flags   += -I $(srctree)/$(src) -I $(objtree)/$(obj)
 157 _a_flags   += -I $(srctree)/$(src) -I $(objtree)/$(obj)
 158 _cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
 159 endif
 160 endif
 161
 162 part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
 163 quiet_modtag = $(if $(part-of-module),[M],   )
 164
 165 modkern_cflags =                                          \
 166         $(if $(part-of-module),                           \
 167                 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
 168                 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags))
 169
 170 modkern_aflags = $(if $(part-of-module),                                \
 171                         $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE),       \
 172                         $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL))
 173
 174 c_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 175                  -include $(srctree)/include/linux/compiler_types.h       \
 176                  $(_c_flags) $(modkern_cflags)                           \
 177                  $(basename_flags) $(modname_flags)
 178
 179 a_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 180                  $(_a_flags) $(modkern_aflags)
 181
 182 cpp_flags      = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 183                  $(_cpp_flags)
 184
 185 ld_flags       = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))
 186
 187 DTC_INCLUDE    := $(srctree)/scripts/dtc/include-prefixes
 188
 189 dtc_cpp_flags  = -Wp,-MD,$(depfile).pre.tmp -nostdinc                    \
 190                  $(addprefix -I,$(DTC_INCLUDE))                          \
 191                  -undef -D__DTS__
 192
 193 # Useful for describing the dependency of composite objects
 194 # Usage:
 195 #   $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
 196 define multi_depend
 197 $(foreach m, $(notdir $1), \
 198         $(eval $(obj)/$m: \
 199         $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
 200 endef
 201
 202 # Shipped files
 203 # ===========================================================================
 204
 205 quiet_cmd_shipped = SHIPPED $@
 206 cmd_shipped = cat $< > $@
 207
 208 $(obj)/%: $(src)/%_shipped
 209         $(call cmd,shipped)
 210
 211 # Commands useful for building a boot image
 212 # ===========================================================================
 213 #
 214 #       Use as following:
 215 #
 216 #       target: source(s) FORCE
 217 #               $(if_changed,ld/objcopy/gzip)
 218 #
 219 #       and add target to extra-y so that we know we have to
 220 #       read in the saved command line
 221
 222 # Linking
 223 # ---------------------------------------------------------------------------
 224
 225 quiet_cmd_ld = LD      $@
 226       cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@
 227
 228 # Archive
 229 # ---------------------------------------------------------------------------
 230
 231 quiet_cmd_ar = AR      $@
 232       cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs)
 233
 234 # Objcopy
 235 # ---------------------------------------------------------------------------
 236
 237 quiet_cmd_objcopy = OBJCOPY $@
 238 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
 239
 240 # Gzip
 241 # ---------------------------------------------------------------------------
 242
 243 quiet_cmd_gzip = GZIP    $@
 244       cmd_gzip = cat $(real-prereqs) | gzip -n -f -9 > $@
 245
 246 # DTC
 247 # ---------------------------------------------------------------------------
 248 DTC ?= $(objtree)/scripts/dtc/dtc
 249
 250 # Disable noisy checks by default
 251 ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
 252 DTC_FLAGS += -Wno-unit_address_vs_reg \
 253         -Wno-unit_address_format \
 254         -Wno-avoid_unnecessary_addr_size \
 255         -Wno-alias_paths \
 256         -Wno-graph_child_address \
 257         -Wno-simple_bus_reg \
 258         -Wno-unique_unit_address \
 259         -Wno-pci_device_reg
 260 endif
 261
 262 ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)
 263 DTC_FLAGS += -Wnode_name_chars_strict \
 264         -Wproperty_name_chars_strict
 265 endif
 266
 267 DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
 268
 269 # Generate an assembly file to wrap the output of the device tree compiler
 270 quiet_cmd_dt_S_dtb= DTB     $@
 271 cmd_dt_S_dtb=                                           \
 272 {                                                       \
 273         echo '\#include <asm-generic/vmlinux.lds.h>';   \
 274         echo '.section .dtb.init.rodata,"a"';           \
 275         echo '.balign STRUCT_ALIGNMENT';                \
 276         echo '.global __dtb_$(subst -,_,$(*F))_begin';  \
 277         echo '__dtb_$(subst -,_,$(*F))_begin:';         \
 278         echo '.incbin "$<" ';                           \
 279         echo '__dtb_$(subst -,_,$(*F))_end:';           \
 280         echo '.global __dtb_$(subst -,_,$(*F))_end';    \
 281         echo '.balign STRUCT_ALIGNMENT';                \
 282 } > $@
 283
 284 $(obj)/%.dtb.S: $(obj)/%.dtb FORCE
 285         $(call if_changed,dt_S_dtb)
 286
 287 quiet_cmd_dtc = DTC     $@
 288 cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
 289         $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
 290         $(DTC) -O $(2) -o $@ -b 0 \
 291                 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
 292                 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
 293         cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
 294
 295 $(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
 296         $(call if_changed_dep,dtc,dtb)
 297
 298 DT_CHECKER ?= dt-validate
 299 DT_BINDING_DIR := Documentation/devicetree/bindings
 300 # DT_TMP_SCHEMA may be overridden from Documentation/devicetree/bindings/Makefile
 301 DT_TMP_SCHEMA ?= $(objtree)/$(DT_BINDING_DIR)/processed-schema.yaml
 302
 303 quiet_cmd_dtb_check =   CHECK   $@
 304       cmd_dtb_check =   $(DT_CHECKER) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@
 305
 306 define rule_dtc
 307         $(call cmd_and_fixdep,dtc,yaml)
 308         $(call cmd,dtb_check)
 309 endef
 310
 311 $(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
 312         $(call if_changed_rule,dtc)
 313
 314 dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
 315
 316 # Bzip2
 317 # ---------------------------------------------------------------------------
 318
 319 # Bzip2 and LZMA do not include size in file... so we have to fake that;
 320 # append the size as a 32-bit littleendian number as gzip does.
 321 size_append = printf $(shell                                            \
 322 dec_size=0;                                                             \
 323 for F in $(real-prereqs); do                                    \
 324         fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F);  \
 325         dec_size=$$(expr $$dec_size + $$fsize);                         \
 326 done;                                                                   \
 327 printf "%08x\n" $$dec_size |                                            \
 328         sed 's/\(..\)/\1 /g' | {                                        \
 329                 read ch0 ch1 ch2 ch3;                                   \
 330                 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do                   \
 331                         printf '%s%03o' '\\' $$((0x$$ch));              \
 332                 done;                                                   \
 333         }                                                               \
 334 )
 335
 336 quiet_cmd_bzip2 = BZIP2   $@
 337       cmd_bzip2 = { cat $(real-prereqs) | bzip2 -9; $(size_append); } > $@
 338
 339 # Lzma
 340 # ---------------------------------------------------------------------------
 341
 342 quiet_cmd_lzma = LZMA    $@
 343       cmd_lzma = { cat $(real-prereqs) | lzma -9; $(size_append); } > $@
 344
 345 quiet_cmd_lzo = LZO     $@
 346       cmd_lzo = { cat $(real-prereqs) | lzop -9; $(size_append); } > $@
 347
 348 quiet_cmd_lz4 = LZ4     $@
 349       cmd_lz4 = { cat $(real-prereqs) | lz4c -l -c1 stdin stdout; \
 350                   $(size_append); } > $@
 351
 352 # U-Boot mkimage
 353 # ---------------------------------------------------------------------------
 354
 355 MKIMAGE := $(srctree)/scripts/mkuboot.sh
 356
 357 # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
 358 # the number of overrides in arch makefiles
 359 UIMAGE_ARCH ?= $(SRCARCH)
 360 UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
 361 UIMAGE_OPTS-y ?=
 362 UIMAGE_TYPE ?= kernel
 363 UIMAGE_LOADADDR ?= arch_must_set_this
 364 UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
 365 UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
 366
 367 quiet_cmd_uimage = UIMAGE  $@
 368       cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
 369                         -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
 370                         -T $(UIMAGE_TYPE) \
 371                         -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
 372                         -n $(UIMAGE_NAME) -d $< $@
 373
 374 # XZ
 375 # ---------------------------------------------------------------------------
 376 # Use xzkern to compress the kernel image and xzmisc to compress other things.
 377 #
 378 # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
 379 # of the kernel decompressor. A BCJ filter is used if it is available for
 380 # the target architecture. xzkern also appends uncompressed size of the data
 381 # using size_append. The .xz format has the size information available at
 382 # the end of the file too, but it's in more complex format and it's good to
 383 # avoid changing the part of the boot code that reads the uncompressed size.
 384 # Note that the bytes added by size_append will make the xz tool think that
 385 # the file is corrupt. This is expected.
 386 #
 387 # xzmisc doesn't use size_append, so it can be used to create normal .xz
 388 # files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
 389 # big dictionary would increase the memory usage too much in the multi-call
 390 # decompression mode. A BCJ filter isn't used either.
 391 quiet_cmd_xzkern = XZKERN  $@
 392       cmd_xzkern = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \
 393                      $(size_append); } > $@
 394
 395 quiet_cmd_xzmisc = XZMISC  $@
 396       cmd_xzmisc = cat $(real-prereqs) | xz --check=crc32 --lzma2=dict=1MiB > $@
 397
 398 # ASM offsets
 399 # ---------------------------------------------------------------------------
 400
 401 # Default sed regexp - multiline due to syntax constraints
 402 #
 403 # Use [:space:] because LLVM's integrated assembler inserts <tab> around
 404 # the .ascii directive whereas GCC keeps the <space> as-is.
 405 define sed-offsets
 406         's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
 407         /^->/{s:->#\(.*\):/* \1 */:; \
 408         s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
 409         s:->::; p;}'
 410 endef
 411
 412 # Use filechk to avoid rebuilds when a header changes, but the resulting file
 413 # does not
 414 define filechk_offsets
 415          echo "#ifndef $2"; \
 416          echo "#define $2"; \
 417          echo "/*"; \
 418          echo " * DO NOT MODIFY."; \
 419          echo " *"; \
 420          echo " * This file was generated by Kbuild"; \
 421          echo " */"; \
 422          echo ""; \
 423          sed -ne $(sed-offsets) < $<; \
 424          echo ""; \
 425          echo "#endif"
 426 endef