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1# SPDX-License-Identifier: GPL-2.0
2# Backward compatibility
3asflags-y += $(EXTRA_AFLAGS)
4ccflags-y += $(EXTRA_CFLAGS)
5cppflags-y += $(EXTRA_CPPFLAGS)
6ldflags-y += $(EXTRA_LDFLAGS)
7
8# flags that take effect in current and sub directories
9KBUILD_AFLAGS += $(subdir-asflags-y)
10KBUILD_CFLAGS += $(subdir-ccflags-y)
11KBUILD_RUSTFLAGS += $(subdir-rustflags-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
18obj-m := $(filter-out $(obj-y),$(obj-m))
19
20# Libraries are always collected in one lib file.
21# Filter out objects already built-in
22lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
23
24# Subdirectories we need to descend into
25subdir-ym := $(sort $(subdir-y) $(subdir-m) \
26 $(patsubst %/,%, $(filter %/, $(obj-y) $(obj-m))))
27
28# Handle objects in subdirs:
29# - If we encounter foo in $(obj-y), replace it by foo/built-in.a and
30# foo/modules.order
31# - If we encounter foo/ in $(obj-m), replace it by foo/modules.order
32#
33# Generate modules.order to determine modorder. Unfortunately, we don't have
34# information about ordering between -y and -m subdirs. Just put -y's first.
35
36ifdef need-modorder
37obj-m := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m))
38else
39obj-m := $(filter-out %/, $(obj-m))
40endif
41
42ifdef need-builtin
43obj-y := $(patsubst %/, %/built-in.a, $(obj-y))
44else
45obj-y := $(filter-out %/, $(obj-y))
46endif
47
48# Expand $(foo-objs) $(foo-y) etc. by replacing their individuals
49suffix-search = $(strip $(foreach s, $3, $($(1:%$(strip $2)=%$s))))
50# List composite targets that are constructed by combining other targets
51multi-search = $(sort $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $m)))
52# List primitive targets that are compiled from source files
53real-search = $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $(call suffix-search, $m, $2, $3), $m))
54
55# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object
56multi-obj-y := $(call multi-search, $(obj-y), .o, -objs -y)
57multi-obj-m := $(call multi-search, $(obj-m), .o, -objs -y -m)
58multi-obj-ym := $(multi-obj-y) $(multi-obj-m)
59
60# Replace multi-part objects by their individual parts,
61# including built-in.a from subdirectories
62real-obj-y := $(call real-search, $(obj-y), .o, -objs -y)
63real-obj-m := $(call real-search, $(obj-m), .o, -objs -y -m)
64
65always-y += $(always-m)
66
67# hostprogs-always-y += foo
68# ... is a shorthand for
69# hostprogs += foo
70# always-y += foo
71hostprogs += $(hostprogs-always-y) $(hostprogs-always-m)
72always-y += $(hostprogs-always-y) $(hostprogs-always-m)
73
74# userprogs-always-y is likewise.
75userprogs += $(userprogs-always-y) $(userprogs-always-m)
76always-y += $(userprogs-always-y) $(userprogs-always-m)
77
78# DTB
79# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
80dtb-$(CONFIG_OF_ALL_DTBS) += $(dtb-)
81
82# Composite DTB (i.e. DTB constructed by overlay)
83multi-dtb-y := $(call multi-search, $(dtb-y), .dtb, -dtbs)
84# Primitive DTB compiled from *.dts
85real-dtb-y := $(call real-search, $(dtb-y), .dtb, -dtbs)
86# Base DTB that overlay is applied onto
87base-dtb-y := $(filter %.dtb, $(call real-search, $(multi-dtb-y), .dtb, -dtbs))
88
89always-y += $(dtb-y)
90
91# Add subdir path
92
93ifneq ($(obj),.)
94extra-y := $(addprefix $(obj)/,$(extra-y))
95always-y := $(addprefix $(obj)/,$(always-y))
96targets := $(addprefix $(obj)/,$(targets))
97obj-m := $(addprefix $(obj)/,$(obj-m))
98lib-y := $(addprefix $(obj)/,$(lib-y))
99real-obj-y := $(addprefix $(obj)/,$(real-obj-y))
100real-obj-m := $(addprefix $(obj)/,$(real-obj-m))
101multi-obj-m := $(addprefix $(obj)/, $(multi-obj-m))
102multi-dtb-y := $(addprefix $(obj)/, $(multi-dtb-y))
103real-dtb-y := $(addprefix $(obj)/, $(real-dtb-y))
104subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
105endif
106
107# Finds the multi-part object the current object will be linked into.
108# If the object belongs to two or more multi-part objects, list them all.
109modname-multi = $(sort $(foreach m,$(multi-obj-ym),\
110 $(if $(filter $*.o, $(call suffix-search, $m, .o, -objs -y -m)),$(m:.o=))))
111
112__modname = $(or $(modname-multi),$(basetarget))
113
114modname = $(subst $(space),:,$(__modname))
115modfile = $(addprefix $(obj)/,$(__modname))
116
117# target with $(obj)/ and its suffix stripped
118target-stem = $(basename $(patsubst $(obj)/%,%,$@))
119
120# These flags are needed for modversions and compiling, so we define them here
121# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
122# end up in (or would, if it gets compiled in)
123name-fix-token = $(subst $(comma),_,$(subst -,_,$1))
124name-fix = $(call stringify,$(call name-fix-token,$1))
125basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
126modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname)) \
127 -D__KBUILD_MODNAME=kmod_$(call name-fix-token,$(modname))
128modfile_flags = -DKBUILD_MODFILE=$(call stringify,$(modfile))
129
130_c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), \
131 $(filter-out $(ccflags-remove-y), \
132 $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(ccflags-y)) \
133 $(CFLAGS_$(target-stem).o))
134_rust_flags = $(filter-out $(RUSTFLAGS_REMOVE_$(target-stem).o), \
135 $(filter-out $(rustflags-remove-y), \
136 $(KBUILD_RUSTFLAGS) $(rustflags-y)) \
137 $(RUSTFLAGS_$(target-stem).o))
138_a_flags = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), \
139 $(filter-out $(asflags-remove-y), \
140 $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(asflags-y)) \
141 $(AFLAGS_$(target-stem).o))
142_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds)
143
144#
145# Enable gcov profiling flags for a file, directory or for all files depending
146# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
147# (in this order)
148#
149ifeq ($(CONFIG_GCOV_KERNEL),y)
150_c_flags += $(if $(patsubst n%,, \
151 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
152 $(CFLAGS_GCOV))
153endif
154
155#
156# Enable address sanitizer flags for kernel except some files or directories
157# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
158#
159ifeq ($(CONFIG_KASAN),y)
160ifneq ($(CONFIG_KASAN_HW_TAGS),y)
161_c_flags += $(if $(patsubst n%,, \
162 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
163 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
164endif
165endif
166
167ifeq ($(CONFIG_KMSAN),y)
168_c_flags += $(if $(patsubst n%,, \
169 $(KMSAN_SANITIZE_$(basetarget).o)$(KMSAN_SANITIZE)y), \
170 $(CFLAGS_KMSAN))
171_c_flags += $(if $(patsubst n%,, \
172 $(KMSAN_ENABLE_CHECKS_$(basetarget).o)$(KMSAN_ENABLE_CHECKS)y), \
173 , -mllvm -msan-disable-checks=1)
174endif
175
176ifeq ($(CONFIG_UBSAN),y)
177_c_flags += $(if $(patsubst n%,, \
178 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
179 $(CFLAGS_UBSAN))
180endif
181
182ifeq ($(CONFIG_KCOV),y)
183_c_flags += $(if $(patsubst n%,, \
184 $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
185 $(CFLAGS_KCOV))
186endif
187
188#
189# Enable KCSAN flags except some files or directories we don't want to check
190# (depends on variables KCSAN_SANITIZE_obj.o, KCSAN_SANITIZE)
191#
192ifeq ($(CONFIG_KCSAN),y)
193_c_flags += $(if $(patsubst n%,, \
194 $(KCSAN_SANITIZE_$(basetarget).o)$(KCSAN_SANITIZE)y), \
195 $(CFLAGS_KCSAN))
196# Some uninstrumented files provide implied barriers required to avoid false
197# positives: set KCSAN_INSTRUMENT_BARRIERS for barrier instrumentation only.
198_c_flags += $(if $(patsubst n%,, \
199 $(KCSAN_INSTRUMENT_BARRIERS_$(basetarget).o)$(KCSAN_INSTRUMENT_BARRIERS)n), \
200 -D__KCSAN_INSTRUMENT_BARRIERS__)
201endif
202
203# $(srctree)/$(src) for including checkin headers from generated source files
204# $(objtree)/$(obj) for including generated headers from checkin source files
205ifeq ($(KBUILD_EXTMOD),)
206ifdef building_out_of_srctree
207_c_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
208_a_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
209_cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
210endif
211endif
212
213part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
214quiet_modtag = $(if $(part-of-module),[M], )
215
216modkern_cflags = \
217 $(if $(part-of-module), \
218 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
219 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags))
220
221modkern_rustflags = \
222 $(if $(part-of-module), \
223 $(KBUILD_RUSTFLAGS_MODULE) $(RUSTFLAGS_MODULE), \
224 $(KBUILD_RUSTFLAGS_KERNEL) $(RUSTFLAGS_KERNEL))
225
226modkern_aflags = $(if $(part-of-module), \
227 $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \
228 $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL))
229
230c_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
231 -include $(srctree)/include/linux/compiler_types.h \
232 $(_c_flags) $(modkern_cflags) \
233 $(basename_flags) $(modname_flags)
234
235rust_flags = $(_rust_flags) $(modkern_rustflags) @$(objtree)/include/generated/rustc_cfg
236
237a_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
238 $(_a_flags) $(modkern_aflags)
239
240cpp_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
241 $(_cpp_flags)
242
243ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))
244
245DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes
246
247dtc_cpp_flags = -Wp,-MMD,$(depfile).pre.tmp -nostdinc \
248 $(addprefix -I,$(DTC_INCLUDE)) \
249 -undef -D__DTS__
250
251ifdef CONFIG_OBJTOOL
252
253objtool := $(objtree)/tools/objtool/objtool
254
255objtool-args-$(CONFIG_HAVE_JUMP_LABEL_HACK) += --hacks=jump_label
256objtool-args-$(CONFIG_HAVE_NOINSTR_HACK) += --hacks=noinstr
257objtool-args-$(CONFIG_CALL_DEPTH_TRACKING) += --hacks=skylake
258objtool-args-$(CONFIG_X86_KERNEL_IBT) += --ibt
259objtool-args-$(CONFIG_FINEIBT) += --cfi
260objtool-args-$(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL) += --mcount
261ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
262objtool-args-$(CONFIG_HAVE_OBJTOOL_NOP_MCOUNT) += --mnop
263endif
264objtool-args-$(CONFIG_UNWINDER_ORC) += --orc
265objtool-args-$(CONFIG_RETPOLINE) += --retpoline
266objtool-args-$(CONFIG_RETHUNK) += --rethunk
267objtool-args-$(CONFIG_SLS) += --sls
268objtool-args-$(CONFIG_STACK_VALIDATION) += --stackval
269objtool-args-$(CONFIG_HAVE_STATIC_CALL_INLINE) += --static-call
270objtool-args-$(CONFIG_HAVE_UACCESS_VALIDATION) += --uaccess
271objtool-args-$(CONFIG_GCOV_KERNEL) += --no-unreachable
272objtool-args-$(CONFIG_PREFIX_SYMBOLS) += --prefix=$(CONFIG_FUNCTION_PADDING_BYTES)
273
274objtool-args = $(objtool-args-y) \
275 $(if $(delay-objtool), --link) \
276 $(if $(part-of-module), --module)
277
278delay-objtool := $(or $(CONFIG_LTO_CLANG),$(CONFIG_X86_KERNEL_IBT))
279
280cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool-args) $@)
281cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd)
282
283endif # CONFIG_OBJTOOL
284
285# Useful for describing the dependency of composite objects
286# Usage:
287# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
288define multi_depend
289$(foreach m, $1, \
290 $(eval $m: \
291 $(addprefix $(obj)/, $(call suffix-search, $(patsubst $(obj)/%,%,$m), $2, $3))))
292endef
293
294# Copy a file
295# ===========================================================================
296# 'cp' preserves permissions. If you use it to copy a file in read-only srctree,
297# the copy would be read-only as well, leading to an error when executing the
298# rule next time. Use 'cat' instead in order to generate a writable file.
299quiet_cmd_copy = COPY $@
300 cmd_copy = cat $< > $@
301
302$(obj)/%: $(src)/%_shipped
303 $(call cmd,copy)
304
305# Commands useful for building a boot image
306# ===========================================================================
307#
308# Use as following:
309#
310# target: source(s) FORCE
311# $(if_changed,ld/objcopy/gzip)
312#
313# and add target to 'targets' so that we know we have to
314# read in the saved command line
315
316# Linking
317# ---------------------------------------------------------------------------
318
319quiet_cmd_ld = LD $@
320 cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@
321
322# Archive
323# ---------------------------------------------------------------------------
324
325quiet_cmd_ar = AR $@
326 cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs)
327
328# Objcopy
329# ---------------------------------------------------------------------------
330
331quiet_cmd_objcopy = OBJCOPY $@
332cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
333
334# Gzip
335# ---------------------------------------------------------------------------
336
337quiet_cmd_gzip = GZIP $@
338 cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@
339
340# DTC
341# ---------------------------------------------------------------------------
342DTC ?= $(objtree)/scripts/dtc/dtc
343DTC_FLAGS += -Wno-interrupt_provider \
344 -Wno-unique_unit_address
345
346# Disable noisy checks by default
347ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
348DTC_FLAGS += -Wno-unit_address_vs_reg \
349 -Wno-avoid_unnecessary_addr_size \
350 -Wno-alias_paths \
351 -Wno-graph_child_address \
352 -Wno-simple_bus_reg
353else
354DTC_FLAGS += \
355 -Wunique_unit_address_if_enabled
356endif
357
358ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)
359DTC_FLAGS += -Wnode_name_chars_strict \
360 -Wproperty_name_chars_strict \
361 -Winterrupt_provider \
362 -Wunique_unit_address
363endif
364
365DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
366
367# Set -@ if the target is a base DTB that overlay is applied onto
368DTC_FLAGS += $(if $(filter $(patsubst $(obj)/%,%,$@), $(base-dtb-y)), -@)
369
370# Generate an assembly file to wrap the output of the device tree compiler
371quiet_cmd_wrap_S_dtb = WRAP $@
372 cmd_wrap_S_dtb = { \
373 symbase=__$(patsubst .%,%,$(suffix $<))_$(subst -,_,$(notdir $*)); \
374 echo '\#include <asm-generic/vmlinux.lds.h>'; \
375 echo '.section .dtb.init.rodata,"a"'; \
376 echo '.balign STRUCT_ALIGNMENT'; \
377 echo ".global $${symbase}_begin"; \
378 echo "$${symbase}_begin:"; \
379 echo '.incbin "$<" '; \
380 echo ".global $${symbase}_end"; \
381 echo "$${symbase}_end:"; \
382 echo '.balign STRUCT_ALIGNMENT'; \
383 } > $@
384
385$(obj)/%.dtb.S: $(obj)/%.dtb FORCE
386 $(call if_changed,wrap_S_dtb)
387
388$(obj)/%.dtbo.S: $(obj)/%.dtbo FORCE
389 $(call if_changed,wrap_S_dtb)
390
391quiet_cmd_dtc = DTC $@
392cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
393 $(DTC) -o $@ -b 0 \
394 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
395 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
396 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
397
398quiet_cmd_fdtoverlay = DTOVL $@
399 cmd_fdtoverlay = $(objtree)/scripts/dtc/fdtoverlay -o $@ -i $(real-prereqs)
400
401$(multi-dtb-y): FORCE
402 $(call if_changed,fdtoverlay)
403$(call multi_depend, $(multi-dtb-y), .dtb, -dtbs)
404
405ifneq ($(CHECK_DTBS)$(CHECK_DT_BINDING),)
406DT_CHECKER ?= dt-validate
407DT_CHECKER_FLAGS ?= $(if $(DT_SCHEMA_FILES),-l $(DT_SCHEMA_FILES),-m)
408DT_BINDING_DIR := Documentation/devicetree/bindings
409DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.json
410
411quiet_cmd_dtb = DTC_CHK $@
412 cmd_dtb = $(cmd_dtc) ; $(DT_CHECKER) $(DT_CHECKER_FLAGS) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ || true
413else
414quiet_cmd_dtb = $(quiet_cmd_dtc)
415 cmd_dtb = $(cmd_dtc)
416endif
417
418$(obj)/%.dtb: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
419 $(call if_changed_dep,dtb)
420
421$(obj)/%.dtbo: $(src)/%.dtso $(DTC) FORCE
422 $(call if_changed_dep,dtc)
423
424dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
425
426# Bzip2
427# ---------------------------------------------------------------------------
428
429# Bzip2 and LZMA do not include size in file... so we have to fake that;
430# append the size as a 32-bit littleendian number as gzip does.
431size_append = printf $(shell \
432dec_size=0; \
433for F in $(real-prereqs); do \
434 fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \
435 dec_size=$$(expr $$dec_size + $$fsize); \
436done; \
437printf "%08x\n" $$dec_size | \
438 sed 's/\(..\)/\1 /g' | { \
439 read ch0 ch1 ch2 ch3; \
440 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
441 printf '%s%03o' '\\' $$((0x$$ch)); \
442 done; \
443 } \
444)
445
446quiet_cmd_file_size = GEN $@
447 cmd_file_size = $(size_append) > $@
448
449quiet_cmd_bzip2 = BZIP2 $@
450 cmd_bzip2 = cat $(real-prereqs) | $(KBZIP2) -9 > $@
451
452quiet_cmd_bzip2_with_size = BZIP2 $@
453 cmd_bzip2_with_size = { cat $(real-prereqs) | $(KBZIP2) -9; $(size_append); } > $@
454
455# Lzma
456# ---------------------------------------------------------------------------
457
458quiet_cmd_lzma = LZMA $@
459 cmd_lzma = cat $(real-prereqs) | $(LZMA) -9 > $@
460
461quiet_cmd_lzma_with_size = LZMA $@
462 cmd_lzma_with_size = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@
463
464quiet_cmd_lzo = LZO $@
465 cmd_lzo = cat $(real-prereqs) | $(KLZOP) -9 > $@
466
467quiet_cmd_lzo_with_size = LZO $@
468 cmd_lzo_with_size = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@
469
470quiet_cmd_lz4 = LZ4 $@
471 cmd_lz4 = cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout > $@
472
473quiet_cmd_lz4_with_size = LZ4 $@
474 cmd_lz4_with_size = { cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout; \
475 $(size_append); } > $@
476
477# U-Boot mkimage
478# ---------------------------------------------------------------------------
479
480MKIMAGE := $(srctree)/scripts/mkuboot.sh
481
482# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
483# the number of overrides in arch makefiles
484UIMAGE_ARCH ?= $(SRCARCH)
485UIMAGE_COMPRESSION ?= $(or $(2),none)
486UIMAGE_OPTS-y ?=
487UIMAGE_TYPE ?= kernel
488UIMAGE_LOADADDR ?= arch_must_set_this
489UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
490UIMAGE_NAME ?= Linux-$(KERNELRELEASE)
491
492quiet_cmd_uimage = UIMAGE $@
493 cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
494 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
495 -T $(UIMAGE_TYPE) \
496 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
497 -n '$(UIMAGE_NAME)' -d $< $@
498
499# XZ
500# ---------------------------------------------------------------------------
501# Use xzkern to compress the kernel image and xzmisc to compress other things.
502#
503# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
504# of the kernel decompressor. A BCJ filter is used if it is available for
505# the target architecture. xzkern also appends uncompressed size of the data
506# using size_append. The .xz format has the size information available at
507# the end of the file too, but it's in more complex format and it's good to
508# avoid changing the part of the boot code that reads the uncompressed size.
509# Note that the bytes added by size_append will make the xz tool think that
510# the file is corrupt. This is expected.
511#
512# xzmisc doesn't use size_append, so it can be used to create normal .xz
513# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
514# big dictionary would increase the memory usage too much in the multi-call
515# decompression mode. A BCJ filter isn't used either.
516quiet_cmd_xzkern = XZKERN $@
517 cmd_xzkern = cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh > $@
518
519quiet_cmd_xzkern_with_size = XZKERN $@
520 cmd_xzkern_with_size = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \
521 $(size_append); } > $@
522
523quiet_cmd_xzmisc = XZMISC $@
524 cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@
525
526# ZSTD
527# ---------------------------------------------------------------------------
528# Appends the uncompressed size of the data using size_append. The .zst
529# format has the size information available at the beginning of the file too,
530# but it's in a more complex format and it's good to avoid changing the part
531# of the boot code that reads the uncompressed size.
532#
533# Note that the bytes added by size_append will make the zstd tool think that
534# the file is corrupt. This is expected.
535#
536# zstd uses a maximum window size of 8 MB. zstd22 uses a maximum window size of
537# 128 MB. zstd22 is used for kernel compression because it is decompressed in a
538# single pass, so zstd doesn't need to allocate a window buffer. When streaming
539# decompression is used, like initramfs decompression, zstd22 should likely not
540# be used because it would require zstd to allocate a 128 MB buffer.
541
542quiet_cmd_zstd = ZSTD $@
543 cmd_zstd = cat $(real-prereqs) | $(ZSTD) -19 > $@
544
545quiet_cmd_zstd22 = ZSTD22 $@
546 cmd_zstd22 = cat $(real-prereqs) | $(ZSTD) -22 --ultra > $@
547
548quiet_cmd_zstd22_with_size = ZSTD22 $@
549 cmd_zstd22_with_size = { cat $(real-prereqs) | $(ZSTD) -22 --ultra; $(size_append); } > $@
550
551# ASM offsets
552# ---------------------------------------------------------------------------
553
554# Default sed regexp - multiline due to syntax constraints
555#
556# Use [:space:] because LLVM's integrated assembler inserts <tab> around
557# the .ascii directive whereas GCC keeps the <space> as-is.
558define sed-offsets
559 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
560 /^->/{s:->#\(.*\):/* \1 */:; \
561 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
562 s:->::; p;}'
563endef
564
565# Use filechk to avoid rebuilds when a header changes, but the resulting file
566# does not
567define filechk_offsets
568 echo "#ifndef $2"; \
569 echo "#define $2"; \
570 echo "/*"; \
571 echo " * DO NOT MODIFY."; \
572 echo " *"; \
573 echo " * This file was generated by Kbuild"; \
574 echo " */"; \
575 echo ""; \
576 sed -ne $(sed-offsets) < $<; \
577 echo ""; \
578 echo "#endif"
579endef
1# SPDX-License-Identifier: GPL-2.0
2# Backward compatibility
3asflags-y += $(EXTRA_AFLAGS)
4ccflags-y += $(EXTRA_CFLAGS)
5cppflags-y += $(EXTRA_CPPFLAGS)
6ldflags-y += $(EXTRA_LDFLAGS)
7
8# flags that take effect in current and sub directories
9KBUILD_AFLAGS += $(subdir-asflags-y)
10KBUILD_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
17obj-m := $(filter-out $(obj-y),$(obj-m))
18
19# Libraries are always collected in one lib file.
20# Filter out objects already built-in
21lib-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.
26modorder := $(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)))
35subdir-y += $(__subdir-y)
36__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
37subdir-m += $(__subdir-m)
38obj-y := $(patsubst %/, %/built-in.a, $(obj-y))
39obj-m := $(filter-out %/, $(obj-m))
40
41# Subdirectories we need to descend into
42subdir-ym := $(sort $(subdir-y) $(subdir-m))
43
44# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object
45multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))), $(m))))
46multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)) $($(m:.o=-))), $(m))))
47multi-used := $(multi-used-y) $(multi-used-m)
48
49# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
50# tell kbuild to descend
51subdir-obj-y := $(filter %/built-in.a, $(obj-y))
52
53# Replace multi-part objects by their individual parts,
54# including built-in.a from subdirectories
55real-obj-y := $(foreach m, $(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
56real-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)))
57
58# DTB
59# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
60extra-y += $(dtb-y)
61extra-$(CONFIG_OF_ALL_DTBS) += $(dtb-)
62
63ifneq ($(CHECK_DTBS),)
64extra-y += $(patsubst %.dtb,%.dt.yaml, $(dtb-y))
65extra-$(CONFIG_OF_ALL_DTBS) += $(patsubst %.dtb,%.dt.yaml, $(dtb-))
66endif
67
68# Test self-contained headers
69
70# Wildcard searches in $(srctree)/$(src)/, but not in $(objtree)/$(obj)/.
71# Stale generated headers are often left over, so pattern matching should
72# be avoided. Please notice $(srctree)/$(src)/ and $(objtree)/$(obj) point
73# to the same location for in-tree building. So, header-test-pattern-y should
74# be used with care.
75header-test-y += $(filter-out $(header-test-), \
76 $(patsubst $(srctree)/$(src)/%, %, \
77 $(wildcard $(addprefix $(srctree)/$(src)/, \
78 $(header-test-pattern-y)))))
79
80extra-$(CONFIG_HEADER_TEST) += $(addsuffix .s, $(header-test-y) $(header-test-m))
81
82# Add subdir path
83
84extra-y := $(addprefix $(obj)/,$(extra-y))
85always := $(addprefix $(obj)/,$(always))
86targets := $(addprefix $(obj)/,$(targets))
87modorder := $(addprefix $(obj)/,$(modorder))
88obj-m := $(addprefix $(obj)/,$(obj-m))
89lib-y := $(addprefix $(obj)/,$(lib-y))
90subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
91real-obj-y := $(addprefix $(obj)/,$(real-obj-y))
92real-obj-m := $(addprefix $(obj)/,$(real-obj-m))
93multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
94subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
95
96# Finds the multi-part object the current object will be linked into.
97# If the object belongs to two or more multi-part objects, all of them are
98# concatenated with a colon separator.
99modname-multi = $(subst $(space),:,$(sort $(foreach m,$(multi-used),\
100 $(if $(filter $*.o, $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$(m:.o=)))))
101
102modname = $(if $(modname-multi),$(modname-multi),$(basetarget))
103
104# target with $(obj)/ and its suffix stripped
105target-stem = $(basename $(patsubst $(obj)/%,%,$@))
106
107# These flags are needed for modversions and compiling, so we define them here
108# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
109# end up in (or would, if it gets compiled in)
110name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
111basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
112modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname))
113
114orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) \
115 $(ccflags-y) $(CFLAGS_$(target-stem).o)
116_c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), $(orig_c_flags))
117orig_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) \
118 $(asflags-y) $(AFLAGS_$(target-stem).o)
119_a_flags = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), $(orig_a_flags))
120_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds)
121
122#
123# Enable gcov profiling flags for a file, directory or for all files depending
124# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
125# (in this order)
126#
127ifeq ($(CONFIG_GCOV_KERNEL),y)
128_c_flags += $(if $(patsubst n%,, \
129 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
130 $(CFLAGS_GCOV))
131endif
132
133#
134# Enable address sanitizer flags for kernel except some files or directories
135# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
136#
137ifeq ($(CONFIG_KASAN),y)
138_c_flags += $(if $(patsubst n%,, \
139 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
140 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
141endif
142
143ifeq ($(CONFIG_UBSAN),y)
144_c_flags += $(if $(patsubst n%,, \
145 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
146 $(CFLAGS_UBSAN))
147endif
148
149ifeq ($(CONFIG_KCOV),y)
150_c_flags += $(if $(patsubst n%,, \
151 $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
152 $(CFLAGS_KCOV))
153endif
154
155# $(srctree)/$(src) for including checkin headers from generated source files
156# $(objtree)/$(obj) for including generated headers from checkin source files
157ifeq ($(KBUILD_EXTMOD),)
158ifdef building_out_of_srctree
159_c_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
160_a_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
161_cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
162endif
163endif
164
165part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
166quiet_modtag = $(if $(part-of-module),[M], )
167
168modkern_cflags = \
169 $(if $(part-of-module), \
170 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
171 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
172
173modkern_aflags = $(if $(part-of-module), \
174 $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \
175 $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL))
176
177c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
178 -include $(srctree)/include/linux/compiler_types.h \
179 $(_c_flags) $(modkern_cflags) \
180 $(basename_flags) $(modname_flags)
181
182a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
183 $(_a_flags) $(modkern_aflags)
184
185cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
186 $(_cpp_flags)
187
188ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))
189
190DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes
191
192dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \
193 $(addprefix -I,$(DTC_INCLUDE)) \
194 -undef -D__DTS__
195
196# Useful for describing the dependency of composite objects
197# Usage:
198# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
199define multi_depend
200$(foreach m, $(notdir $1), \
201 $(eval $(obj)/$m: \
202 $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
203endef
204
205# Shipped files
206# ===========================================================================
207
208quiet_cmd_shipped = SHIPPED $@
209cmd_shipped = cat $< > $@
210
211$(obj)/%: $(src)/%_shipped
212 $(call cmd,shipped)
213
214# Commands useful for building a boot image
215# ===========================================================================
216#
217# Use as following:
218#
219# target: source(s) FORCE
220# $(if_changed,ld/objcopy/gzip)
221#
222# and add target to extra-y so that we know we have to
223# read in the saved command line
224
225# Linking
226# ---------------------------------------------------------------------------
227
228quiet_cmd_ld = LD $@
229 cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@
230
231# Archive
232# ---------------------------------------------------------------------------
233
234quiet_cmd_ar = AR $@
235 cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs)
236
237# Objcopy
238# ---------------------------------------------------------------------------
239
240quiet_cmd_objcopy = OBJCOPY $@
241cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
242
243# Gzip
244# ---------------------------------------------------------------------------
245
246quiet_cmd_gzip = GZIP $@
247 cmd_gzip = cat $(real-prereqs) | gzip -n -f -9 > $@
248
249# DTC
250# ---------------------------------------------------------------------------
251DTC ?= $(objtree)/scripts/dtc/dtc
252
253# Disable noisy checks by default
254ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
255DTC_FLAGS += -Wno-unit_address_vs_reg \
256 -Wno-unit_address_format \
257 -Wno-avoid_unnecessary_addr_size \
258 -Wno-alias_paths \
259 -Wno-graph_child_address \
260 -Wno-simple_bus_reg \
261 -Wno-unique_unit_address \
262 -Wno-pci_device_reg
263endif
264
265ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)
266DTC_FLAGS += -Wnode_name_chars_strict \
267 -Wproperty_name_chars_strict
268endif
269
270DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
271
272# Generate an assembly file to wrap the output of the device tree compiler
273quiet_cmd_dt_S_dtb= DTB $@
274cmd_dt_S_dtb= \
275{ \
276 echo '\#include <asm-generic/vmlinux.lds.h>'; \
277 echo '.section .dtb.init.rodata,"a"'; \
278 echo '.balign STRUCT_ALIGNMENT'; \
279 echo '.global __dtb_$(subst -,_,$(*F))_begin'; \
280 echo '__dtb_$(subst -,_,$(*F))_begin:'; \
281 echo '.incbin "$<" '; \
282 echo '__dtb_$(subst -,_,$(*F))_end:'; \
283 echo '.global __dtb_$(subst -,_,$(*F))_end'; \
284 echo '.balign STRUCT_ALIGNMENT'; \
285} > $@
286
287$(obj)/%.dtb.S: $(obj)/%.dtb FORCE
288 $(call if_changed,dt_S_dtb)
289
290quiet_cmd_dtc = DTC $@
291cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
292 $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
293 $(DTC) -O $(2) -o $@ -b 0 \
294 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
295 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
296 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
297
298$(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
299 $(call if_changed_dep,dtc,dtb)
300
301DT_CHECKER ?= dt-validate
302DT_BINDING_DIR := Documentation/devicetree/bindings
303DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.yaml
304
305quiet_cmd_dtb_check = CHECK $@
306 cmd_dtb_check = $(DT_CHECKER) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ ;
307
308define rule_dtc_dt_yaml
309 $(call cmd_and_fixdep,dtc,yaml)
310 $(call cmd,dtb_check)
311endef
312
313$(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
314 $(call if_changed_rule,dtc_dt_yaml)
315
316dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
317
318# Bzip2
319# ---------------------------------------------------------------------------
320
321# Bzip2 and LZMA do not include size in file... so we have to fake that;
322# append the size as a 32-bit littleendian number as gzip does.
323size_append = printf $(shell \
324dec_size=0; \
325for F in $(real-prereqs); do \
326 fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \
327 dec_size=$$(expr $$dec_size + $$fsize); \
328done; \
329printf "%08x\n" $$dec_size | \
330 sed 's/\(..\)/\1 /g' | { \
331 read ch0 ch1 ch2 ch3; \
332 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
333 printf '%s%03o' '\\' $$((0x$$ch)); \
334 done; \
335 } \
336)
337
338quiet_cmd_bzip2 = BZIP2 $@
339 cmd_bzip2 = { cat $(real-prereqs) | bzip2 -9; $(size_append); } > $@
340
341# Lzma
342# ---------------------------------------------------------------------------
343
344quiet_cmd_lzma = LZMA $@
345 cmd_lzma = { cat $(real-prereqs) | lzma -9; $(size_append); } > $@
346
347quiet_cmd_lzo = LZO $@
348 cmd_lzo = { cat $(real-prereqs) | lzop -9; $(size_append); } > $@
349
350quiet_cmd_lz4 = LZ4 $@
351 cmd_lz4 = { cat $(real-prereqs) | lz4c -l -c1 stdin stdout; \
352 $(size_append); } > $@
353
354# U-Boot mkimage
355# ---------------------------------------------------------------------------
356
357MKIMAGE := $(srctree)/scripts/mkuboot.sh
358
359# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
360# the number of overrides in arch makefiles
361UIMAGE_ARCH ?= $(SRCARCH)
362UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
363UIMAGE_OPTS-y ?=
364UIMAGE_TYPE ?= kernel
365UIMAGE_LOADADDR ?= arch_must_set_this
366UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
367UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
368
369quiet_cmd_uimage = UIMAGE $@
370 cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
371 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
372 -T $(UIMAGE_TYPE) \
373 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
374 -n $(UIMAGE_NAME) -d $< $@
375
376# XZ
377# ---------------------------------------------------------------------------
378# Use xzkern to compress the kernel image and xzmisc to compress other things.
379#
380# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
381# of the kernel decompressor. A BCJ filter is used if it is available for
382# the target architecture. xzkern also appends uncompressed size of the data
383# using size_append. The .xz format has the size information available at
384# the end of the file too, but it's in more complex format and it's good to
385# avoid changing the part of the boot code that reads the uncompressed size.
386# Note that the bytes added by size_append will make the xz tool think that
387# the file is corrupt. This is expected.
388#
389# xzmisc doesn't use size_append, so it can be used to create normal .xz
390# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
391# big dictionary would increase the memory usage too much in the multi-call
392# decompression mode. A BCJ filter isn't used either.
393quiet_cmd_xzkern = XZKERN $@
394 cmd_xzkern = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \
395 $(size_append); } > $@
396
397quiet_cmd_xzmisc = XZMISC $@
398 cmd_xzmisc = cat $(real-prereqs) | xz --check=crc32 --lzma2=dict=1MiB > $@
399
400# ASM offsets
401# ---------------------------------------------------------------------------
402
403# Default sed regexp - multiline due to syntax constraints
404#
405# Use [:space:] because LLVM's integrated assembler inserts <tab> around
406# the .ascii directive whereas GCC keeps the <space> as-is.
407define sed-offsets
408 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
409 /^->/{s:->#\(.*\):/* \1 */:; \
410 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
411 s:->::; p;}'
412endef
413
414# Use filechk to avoid rebuilds when a header changes, but the resulting file
415# does not
416define filechk_offsets
417 echo "#ifndef $2"; \
418 echo "#define $2"; \
419 echo "/*"; \
420 echo " * DO NOT MODIFY."; \
421 echo " *"; \
422 echo " * This file was generated by Kbuild"; \
423 echo " */"; \
424 echo ""; \
425 sed -ne $(sed-offsets) < $<; \
426 echo ""; \
427 echo "#endif"
428endef