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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 += $(EXTRA_LDFLAGS)
7ifneq ($(always),)
8$(warning 'always' is deprecated. Please use 'always-y' instead)
9always-y += $(always)
10endif
11ifneq ($(hostprogs-y),)
12$(warning 'hostprogs-y' is deprecated. Please use 'hostprogs' instead)
13hostprogs += $(hostprogs-y)
14endif
15ifneq ($(hostprogs-m),)
16$(warning 'hostprogs-m' is deprecated. Please use 'hostprogs' instead)
17hostprogs += $(hostprogs-m)
18endif
19
20# flags that take effect in current and sub directories
21KBUILD_AFLAGS += $(subdir-asflags-y)
22KBUILD_CFLAGS += $(subdir-ccflags-y)
23
24# Figure out what we need to build from the various variables
25# ===========================================================================
26
27# When an object is listed to be built compiled-in and modular,
28# only build the compiled-in version
29obj-m := $(filter-out $(obj-y),$(obj-m))
30
31# Libraries are always collected in one lib file.
32# Filter out objects already built-in
33lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
34
35# Subdirectories we need to descend into
36subdir-ym := $(sort $(subdir-y) $(subdir-m) \
37 $(patsubst %/,%, $(filter %/, $(obj-y) $(obj-m))))
38
39# Handle objects in subdirs:
40# - If we encounter foo in $(obj-y), replace it by foo/built-in.a and
41# foo/modules.order
42# - If we encounter foo/ in $(obj-m), replace it by foo/modules.order
43#
44# Generate modules.order to determine modorder. Unfortunately, we don't have
45# information about ordering between -y and -m subdirs. Just put -y's first.
46
47ifdef need-modorder
48obj-m := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m))
49else
50obj-m := $(filter-out %/, $(obj-m))
51endif
52
53ifdef need-builtin
54obj-y := $(patsubst %/, %/built-in.a, $(obj-y))
55else
56obj-y := $(filter-out %/, $(obj-y))
57endif
58
59# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object
60multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))), $(m))))
61multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)) $($(m:.o=-))), $(m))))
62multi-used := $(multi-used-y) $(multi-used-m)
63
64# Replace multi-part objects by their individual parts,
65# including built-in.a from subdirectories
66real-obj-y := $(foreach m, $(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
67real-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)))
68
69always-y += $(always-m)
70
71# hostprogs-always-y += foo
72# ... is a shorthand for
73# hostprogs += foo
74# always-y += foo
75hostprogs += $(hostprogs-always-y) $(hostprogs-always-m)
76always-y += $(hostprogs-always-y) $(hostprogs-always-m)
77
78# userprogs-always-y is likewise.
79userprogs += $(userprogs-always-y) $(userprogs-always-m)
80always-y += $(userprogs-always-y) $(userprogs-always-m)
81
82# DTB
83# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
84extra-y += $(dtb-y)
85extra-$(CONFIG_OF_ALL_DTBS) += $(dtb-)
86
87ifneq ($(CHECK_DTBS),)
88extra-y += $(patsubst %.dtb,%.dt.yaml, $(dtb-y))
89extra-$(CONFIG_OF_ALL_DTBS) += $(patsubst %.dtb,%.dt.yaml, $(dtb-))
90endif
91
92# Add subdir path
93
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-used-m := $(addprefix $(obj)/,$(multi-used-m))
102subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
103
104# Finds the multi-part object the current object will be linked into.
105# If the object belongs to two or more multi-part objects, list them all.
106modname-multi = $(sort $(foreach m,$(multi-used),\
107 $(if $(filter $*.o, $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$(m:.o=))))
108
109__modname = $(if $(modname-multi),$(modname-multi),$(basetarget))
110
111modname = $(subst $(space),:,$(__modname))
112modfile = $(addprefix $(obj)/,$(__modname))
113
114# target with $(obj)/ and its suffix stripped
115target-stem = $(basename $(patsubst $(obj)/%,%,$@))
116
117# These flags are needed for modversions and compiling, so we define them here
118# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
119# end up in (or would, if it gets compiled in)
120name-fix = $(call stringify,$(subst $(comma),_,$(subst -,_,$1)))
121basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
122modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname))
123modfile_flags = -DKBUILD_MODFILE=$(call stringify,$(modfile))
124
125_c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), \
126 $(filter-out $(ccflags-remove-y), \
127 $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(ccflags-y)) \
128 $(CFLAGS_$(target-stem).o))
129_a_flags = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), \
130 $(filter-out $(asflags-remove-y), \
131 $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(asflags-y)) \
132 $(AFLAGS_$(target-stem).o))
133_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds)
134
135#
136# Enable gcov profiling flags for a file, directory or for all files depending
137# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
138# (in this order)
139#
140ifeq ($(CONFIG_GCOV_KERNEL),y)
141_c_flags += $(if $(patsubst n%,, \
142 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
143 $(CFLAGS_GCOV))
144endif
145
146#
147# Enable address sanitizer flags for kernel except some files or directories
148# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
149#
150ifeq ($(CONFIG_KASAN),y)
151_c_flags += $(if $(patsubst n%,, \
152 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
153 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
154endif
155
156ifeq ($(CONFIG_UBSAN),y)
157_c_flags += $(if $(patsubst n%,, \
158 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
159 $(CFLAGS_UBSAN))
160endif
161
162ifeq ($(CONFIG_KCOV),y)
163_c_flags += $(if $(patsubst n%,, \
164 $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
165 $(CFLAGS_KCOV))
166endif
167
168#
169# Enable KCSAN flags except some files or directories we don't want to check
170# (depends on variables KCSAN_SANITIZE_obj.o, KCSAN_SANITIZE)
171#
172ifeq ($(CONFIG_KCSAN),y)
173_c_flags += $(if $(patsubst n%,, \
174 $(KCSAN_SANITIZE_$(basetarget).o)$(KCSAN_SANITIZE)y), \
175 $(CFLAGS_KCSAN))
176endif
177
178# $(srctree)/$(src) for including checkin headers from generated source files
179# $(objtree)/$(obj) for including generated headers from checkin source files
180ifeq ($(KBUILD_EXTMOD),)
181ifdef building_out_of_srctree
182_c_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
183_a_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
184_cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
185endif
186endif
187
188part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
189quiet_modtag = $(if $(part-of-module),[M], )
190
191modkern_cflags = \
192 $(if $(part-of-module), \
193 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
194 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags))
195
196modkern_aflags = $(if $(part-of-module), \
197 $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \
198 $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL))
199
200c_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
201 -include $(srctree)/include/linux/compiler_types.h \
202 $(_c_flags) $(modkern_cflags) \
203 $(basename_flags) $(modname_flags)
204
205a_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
206 $(_a_flags) $(modkern_aflags)
207
208cpp_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
209 $(_cpp_flags)
210
211ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))
212
213DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes
214
215dtc_cpp_flags = -Wp,-MMD,$(depfile).pre.tmp -nostdinc \
216 $(addprefix -I,$(DTC_INCLUDE)) \
217 -undef -D__DTS__
218
219# Useful for describing the dependency of composite objects
220# Usage:
221# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
222define multi_depend
223$(foreach m, $(notdir $1), \
224 $(eval $(obj)/$m: \
225 $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
226endef
227
228quiet_cmd_copy = COPY $@
229 cmd_copy = cp $< $@
230
231# Shipped files
232# ===========================================================================
233
234quiet_cmd_shipped = SHIPPED $@
235cmd_shipped = cat $< > $@
236
237$(obj)/%: $(src)/%_shipped
238 $(call cmd,shipped)
239
240# Commands useful for building a boot image
241# ===========================================================================
242#
243# Use as following:
244#
245# target: source(s) FORCE
246# $(if_changed,ld/objcopy/gzip)
247#
248# and add target to extra-y so that we know we have to
249# read in the saved command line
250
251# Linking
252# ---------------------------------------------------------------------------
253
254quiet_cmd_ld = LD $@
255 cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@
256
257# Archive
258# ---------------------------------------------------------------------------
259
260quiet_cmd_ar = AR $@
261 cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs)
262
263# Objcopy
264# ---------------------------------------------------------------------------
265
266quiet_cmd_objcopy = OBJCOPY $@
267cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
268
269# Gzip
270# ---------------------------------------------------------------------------
271
272quiet_cmd_gzip = GZIP $@
273 cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@
274
275# DTC
276# ---------------------------------------------------------------------------
277DTC ?= $(objtree)/scripts/dtc/dtc
278DTC_FLAGS += -Wno-interrupt_provider
279
280# Disable noisy checks by default
281ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
282DTC_FLAGS += -Wno-unit_address_vs_reg \
283 -Wno-unit_address_format \
284 -Wno-avoid_unnecessary_addr_size \
285 -Wno-alias_paths \
286 -Wno-graph_child_address \
287 -Wno-simple_bus_reg \
288 -Wno-unique_unit_address \
289 -Wno-pci_device_reg
290endif
291
292ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)
293DTC_FLAGS += -Wnode_name_chars_strict \
294 -Wproperty_name_chars_strict \
295 -Winterrupt_provider
296endif
297
298DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
299
300# Generate an assembly file to wrap the output of the device tree compiler
301quiet_cmd_dt_S_dtb= DTB $@
302cmd_dt_S_dtb= \
303{ \
304 echo '\#include <asm-generic/vmlinux.lds.h>'; \
305 echo '.section .dtb.init.rodata,"a"'; \
306 echo '.balign STRUCT_ALIGNMENT'; \
307 echo '.global __dtb_$(subst -,_,$(*F))_begin'; \
308 echo '__dtb_$(subst -,_,$(*F))_begin:'; \
309 echo '.incbin "$<" '; \
310 echo '__dtb_$(subst -,_,$(*F))_end:'; \
311 echo '.global __dtb_$(subst -,_,$(*F))_end'; \
312 echo '.balign STRUCT_ALIGNMENT'; \
313} > $@
314
315$(obj)/%.dtb.S: $(obj)/%.dtb FORCE
316 $(call if_changed,dt_S_dtb)
317
318quiet_cmd_dtc = DTC $@
319cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
320 $(DTC) -O $(patsubst .%,%,$(suffix $@)) -o $@ -b 0 \
321 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
322 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
323 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
324
325$(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
326 $(call if_changed_dep,dtc)
327
328DT_CHECKER ?= dt-validate
329DT_BINDING_DIR := Documentation/devicetree/bindings
330# DT_TMP_SCHEMA may be overridden from Documentation/devicetree/bindings/Makefile
331DT_TMP_SCHEMA ?= $(objtree)/$(DT_BINDING_DIR)/processed-schema.yaml
332
333quiet_cmd_dtb_check = CHECK $@
334 cmd_dtb_check = $(DT_CHECKER) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@
335
336define rule_dtc
337 $(call cmd_and_fixdep,dtc)
338 $(call cmd,dtb_check)
339endef
340
341$(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
342 $(call if_changed_rule,dtc,yaml)
343
344dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
345
346# Bzip2
347# ---------------------------------------------------------------------------
348
349# Bzip2 and LZMA do not include size in file... so we have to fake that;
350# append the size as a 32-bit littleendian number as gzip does.
351size_append = printf $(shell \
352dec_size=0; \
353for F in $(real-prereqs); do \
354 fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \
355 dec_size=$$(expr $$dec_size + $$fsize); \
356done; \
357printf "%08x\n" $$dec_size | \
358 sed 's/\(..\)/\1 /g' | { \
359 read ch0 ch1 ch2 ch3; \
360 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
361 printf '%s%03o' '\\' $$((0x$$ch)); \
362 done; \
363 } \
364)
365
366quiet_cmd_bzip2 = BZIP2 $@
367 cmd_bzip2 = { cat $(real-prereqs) | $(KBZIP2) -9; $(size_append); } > $@
368
369# Lzma
370# ---------------------------------------------------------------------------
371
372quiet_cmd_lzma = LZMA $@
373 cmd_lzma = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@
374
375quiet_cmd_lzo = LZO $@
376 cmd_lzo = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@
377
378quiet_cmd_lz4 = LZ4 $@
379 cmd_lz4 = { cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout; \
380 $(size_append); } > $@
381
382# U-Boot mkimage
383# ---------------------------------------------------------------------------
384
385MKIMAGE := $(srctree)/scripts/mkuboot.sh
386
387# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
388# the number of overrides in arch makefiles
389UIMAGE_ARCH ?= $(SRCARCH)
390UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
391UIMAGE_OPTS-y ?=
392UIMAGE_TYPE ?= kernel
393UIMAGE_LOADADDR ?= arch_must_set_this
394UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
395UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
396
397quiet_cmd_uimage = UIMAGE $@
398 cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
399 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
400 -T $(UIMAGE_TYPE) \
401 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
402 -n $(UIMAGE_NAME) -d $< $@
403
404# XZ
405# ---------------------------------------------------------------------------
406# Use xzkern to compress the kernel image and xzmisc to compress other things.
407#
408# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
409# of the kernel decompressor. A BCJ filter is used if it is available for
410# the target architecture. xzkern also appends uncompressed size of the data
411# using size_append. The .xz format has the size information available at
412# the end of the file too, but it's in more complex format and it's good to
413# avoid changing the part of the boot code that reads the uncompressed size.
414# Note that the bytes added by size_append will make the xz tool think that
415# the file is corrupt. This is expected.
416#
417# xzmisc doesn't use size_append, so it can be used to create normal .xz
418# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
419# big dictionary would increase the memory usage too much in the multi-call
420# decompression mode. A BCJ filter isn't used either.
421quiet_cmd_xzkern = XZKERN $@
422 cmd_xzkern = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \
423 $(size_append); } > $@
424
425quiet_cmd_xzmisc = XZMISC $@
426 cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@
427
428# ZSTD
429# ---------------------------------------------------------------------------
430# Appends the uncompressed size of the data using size_append. The .zst
431# format has the size information available at the beginning of the file too,
432# but it's in a more complex format and it's good to avoid changing the part
433# of the boot code that reads the uncompressed size.
434#
435# Note that the bytes added by size_append will make the zstd tool think that
436# the file is corrupt. This is expected.
437#
438# zstd uses a maximum window size of 8 MB. zstd22 uses a maximum window size of
439# 128 MB. zstd22 is used for kernel compression because it is decompressed in a
440# single pass, so zstd doesn't need to allocate a window buffer. When streaming
441# decompression is used, like initramfs decompression, zstd22 should likely not
442# be used because it would require zstd to allocate a 128 MB buffer.
443
444quiet_cmd_zstd = ZSTD $@
445 cmd_zstd = { cat $(real-prereqs) | $(ZSTD) -19; $(size_append); } > $@
446
447quiet_cmd_zstd22 = ZSTD22 $@
448 cmd_zstd22 = { cat $(real-prereqs) | $(ZSTD) -22 --ultra; $(size_append); } > $@
449
450# ASM offsets
451# ---------------------------------------------------------------------------
452
453# Default sed regexp - multiline due to syntax constraints
454#
455# Use [:space:] because LLVM's integrated assembler inserts <tab> around
456# the .ascii directive whereas GCC keeps the <space> as-is.
457define sed-offsets
458 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
459 /^->/{s:->#\(.*\):/* \1 */:; \
460 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
461 s:->::; p;}'
462endef
463
464# Use filechk to avoid rebuilds when a header changes, but the resulting file
465# does not
466define filechk_offsets
467 echo "#ifndef $2"; \
468 echo "#define $2"; \
469 echo "/*"; \
470 echo " * DO NOT MODIFY."; \
471 echo " *"; \
472 echo " * This file was generated by Kbuild"; \
473 echo " */"; \
474 echo ""; \
475 sed -ne $(sed-offsets) < $<; \
476 echo ""; \
477 echo "#endif"
478endef
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 (each first word of $(*-dtbs) expansion)
87base-dtb-y := $(foreach m, $(multi-dtb-y), $(firstword $(call suffix-search, $m, .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_dt_S_dtb= DTBS $@
372cmd_dt_S_dtb= \
373{ \
374 echo '\#include <asm-generic/vmlinux.lds.h>'; \
375 echo '.section .dtb.init.rodata,"a"'; \
376 echo '.balign STRUCT_ALIGNMENT'; \
377 echo '.global __dtb_$(subst -,_,$(*F))_begin'; \
378 echo '__dtb_$(subst -,_,$(*F))_begin:'; \
379 echo '.incbin "$<" '; \
380 echo '__dtb_$(subst -,_,$(*F))_end:'; \
381 echo '.global __dtb_$(subst -,_,$(*F))_end'; \
382 echo '.balign STRUCT_ALIGNMENT'; \
383} > $@
384
385$(obj)/%.dtb.S: $(obj)/%.dtb FORCE
386 $(call if_changed,dt_S_dtb)
387
388# Generate an assembly file to wrap the output of the device tree compiler
389quiet_cmd_dt_S_dtbo= DTBOS $@
390cmd_dt_S_dtbo= \
391{ \
392 echo '\#include <asm-generic/vmlinux.lds.h>'; \
393 echo '.section .dtb.init.rodata,"a"'; \
394 echo '.balign STRUCT_ALIGNMENT'; \
395 echo '.global __dtbo_$(subst -,_,$(*F))_begin'; \
396 echo '__dtbo_$(subst -,_,$(*F))_begin:'; \
397 echo '.incbin "$<" '; \
398 echo '__dtbo_$(subst -,_,$(*F))_end:'; \
399 echo '.global __dtbo_$(subst -,_,$(*F))_end'; \
400 echo '.balign STRUCT_ALIGNMENT'; \
401} > $@
402
403$(obj)/%.dtbo.S: $(obj)/%.dtbo FORCE
404 $(call if_changed,dt_S_dtbo)
405
406quiet_cmd_dtc = DTC $@
407cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
408 $(DTC) -o $@ -b 0 \
409 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
410 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
411 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
412
413quiet_cmd_fdtoverlay = DTOVL $@
414 cmd_fdtoverlay = $(objtree)/scripts/dtc/fdtoverlay -o $@ -i $(real-prereqs)
415
416$(multi-dtb-y): FORCE
417 $(call if_changed,fdtoverlay)
418$(call multi_depend, $(multi-dtb-y), .dtb, -dtbs)
419
420ifneq ($(CHECK_DTBS)$(CHECK_DT_BINDING),)
421DT_CHECKER ?= dt-validate
422DT_CHECKER_FLAGS ?= $(if $(DT_SCHEMA_FILES),-l $(DT_SCHEMA_FILES),-m)
423DT_BINDING_DIR := Documentation/devicetree/bindings
424DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.json
425
426quiet_cmd_dtb = DTC_CHK $@
427 cmd_dtb = $(cmd_dtc) ; $(DT_CHECKER) $(DT_CHECKER_FLAGS) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ || true
428else
429quiet_cmd_dtb = $(quiet_cmd_dtc)
430 cmd_dtb = $(cmd_dtc)
431endif
432
433$(obj)/%.dtb: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
434 $(call if_changed_dep,dtb)
435
436$(obj)/%.dtbo: $(src)/%.dts $(DTC) FORCE
437 $(call if_changed_dep,dtc)
438
439$(obj)/%.dtbo: $(src)/%.dtso $(DTC) FORCE
440 $(call if_changed_dep,dtc)
441
442dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
443
444# Bzip2
445# ---------------------------------------------------------------------------
446
447# Bzip2 and LZMA do not include size in file... so we have to fake that;
448# append the size as a 32-bit littleendian number as gzip does.
449size_append = printf $(shell \
450dec_size=0; \
451for F in $(real-prereqs); do \
452 fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \
453 dec_size=$$(expr $$dec_size + $$fsize); \
454done; \
455printf "%08x\n" $$dec_size | \
456 sed 's/\(..\)/\1 /g' | { \
457 read ch0 ch1 ch2 ch3; \
458 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
459 printf '%s%03o' '\\' $$((0x$$ch)); \
460 done; \
461 } \
462)
463
464quiet_cmd_file_size = GEN $@
465 cmd_file_size = $(size_append) > $@
466
467quiet_cmd_bzip2 = BZIP2 $@
468 cmd_bzip2 = cat $(real-prereqs) | $(KBZIP2) -9 > $@
469
470quiet_cmd_bzip2_with_size = BZIP2 $@
471 cmd_bzip2_with_size = { cat $(real-prereqs) | $(KBZIP2) -9; $(size_append); } > $@
472
473# Lzma
474# ---------------------------------------------------------------------------
475
476quiet_cmd_lzma = LZMA $@
477 cmd_lzma = cat $(real-prereqs) | $(LZMA) -9 > $@
478
479quiet_cmd_lzma_with_size = LZMA $@
480 cmd_lzma_with_size = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@
481
482quiet_cmd_lzo = LZO $@
483 cmd_lzo = cat $(real-prereqs) | $(KLZOP) -9 > $@
484
485quiet_cmd_lzo_with_size = LZO $@
486 cmd_lzo_with_size = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@
487
488quiet_cmd_lz4 = LZ4 $@
489 cmd_lz4 = cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout > $@
490
491quiet_cmd_lz4_with_size = LZ4 $@
492 cmd_lz4_with_size = { cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout; \
493 $(size_append); } > $@
494
495# U-Boot mkimage
496# ---------------------------------------------------------------------------
497
498MKIMAGE := $(srctree)/scripts/mkuboot.sh
499
500# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
501# the number of overrides in arch makefiles
502UIMAGE_ARCH ?= $(SRCARCH)
503UIMAGE_COMPRESSION ?= $(or $(2),none)
504UIMAGE_OPTS-y ?=
505UIMAGE_TYPE ?= kernel
506UIMAGE_LOADADDR ?= arch_must_set_this
507UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
508UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
509
510quiet_cmd_uimage = UIMAGE $@
511 cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
512 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
513 -T $(UIMAGE_TYPE) \
514 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
515 -n $(UIMAGE_NAME) -d $< $@
516
517# XZ
518# ---------------------------------------------------------------------------
519# Use xzkern to compress the kernel image and xzmisc to compress other things.
520#
521# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
522# of the kernel decompressor. A BCJ filter is used if it is available for
523# the target architecture. xzkern also appends uncompressed size of the data
524# using size_append. The .xz format has the size information available at
525# the end of the file too, but it's in more complex format and it's good to
526# avoid changing the part of the boot code that reads the uncompressed size.
527# Note that the bytes added by size_append will make the xz tool think that
528# the file is corrupt. This is expected.
529#
530# xzmisc doesn't use size_append, so it can be used to create normal .xz
531# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
532# big dictionary would increase the memory usage too much in the multi-call
533# decompression mode. A BCJ filter isn't used either.
534quiet_cmd_xzkern = XZKERN $@
535 cmd_xzkern = cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh > $@
536
537quiet_cmd_xzkern_with_size = XZKERN $@
538 cmd_xzkern_with_size = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \
539 $(size_append); } > $@
540
541quiet_cmd_xzmisc = XZMISC $@
542 cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@
543
544# ZSTD
545# ---------------------------------------------------------------------------
546# Appends the uncompressed size of the data using size_append. The .zst
547# format has the size information available at the beginning of the file too,
548# but it's in a more complex format and it's good to avoid changing the part
549# of the boot code that reads the uncompressed size.
550#
551# Note that the bytes added by size_append will make the zstd tool think that
552# the file is corrupt. This is expected.
553#
554# zstd uses a maximum window size of 8 MB. zstd22 uses a maximum window size of
555# 128 MB. zstd22 is used for kernel compression because it is decompressed in a
556# single pass, so zstd doesn't need to allocate a window buffer. When streaming
557# decompression is used, like initramfs decompression, zstd22 should likely not
558# be used because it would require zstd to allocate a 128 MB buffer.
559
560quiet_cmd_zstd = ZSTD $@
561 cmd_zstd = cat $(real-prereqs) | $(ZSTD) -19 > $@
562
563quiet_cmd_zstd22 = ZSTD22 $@
564 cmd_zstd22 = cat $(real-prereqs) | $(ZSTD) -22 --ultra > $@
565
566quiet_cmd_zstd22_with_size = ZSTD22 $@
567 cmd_zstd22_with_size = { cat $(real-prereqs) | $(ZSTD) -22 --ultra; $(size_append); } > $@
568
569# ASM offsets
570# ---------------------------------------------------------------------------
571
572# Default sed regexp - multiline due to syntax constraints
573#
574# Use [:space:] because LLVM's integrated assembler inserts <tab> around
575# the .ascii directive whereas GCC keeps the <space> as-is.
576define sed-offsets
577 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
578 /^->/{s:->#\(.*\):/* \1 */:; \
579 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
580 s:->::; p;}'
581endef
582
583# Use filechk to avoid rebuilds when a header changes, but the resulting file
584# does not
585define filechk_offsets
586 echo "#ifndef $2"; \
587 echo "#define $2"; \
588 echo "/*"; \
589 echo " * DO NOT MODIFY."; \
590 echo " *"; \
591 echo " * This file was generated by Kbuild"; \
592 echo " */"; \
593 echo ""; \
594 sed -ne $(sed-offsets) < $<; \
595 echo ""; \
596 echo "#endif"
597endef