projects/linux·blob v7.3-rc2 · refs

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1# SPDX-License-Identifier: GPL-2.0
2
3# Finds the multi-part object the current object will be linked into.
4# If the object belongs to two or more multi-part objects, list them all.
5modname-multi = $(sort $(foreach m,$(multi-obj-ym),\
6 $(if $(filter $*.o, $(call suffix-search, $m, .o, -objs -y -m)),$(m:.o=))))
7
8__modname = $(or $(modname-multi),$(basetarget))
9
10modname = $(subst $(space),:,$(__modname))
11modfile = $(addprefix $(obj)/,$(__modname))
12
13# target with $(obj)/ and its suffix stripped
14target-stem = $(basename $(patsubst $(obj)/%,%,$@))
15
16# These flags are needed for modversions and compiling, so we define them here
17# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
18# end up in (or would, if it gets compiled in)
19name-fix-token = $(subst $(comma),_,$(subst -,_,$1))
20name-fix = $(call stringify,$(call name-fix-token,$1))
21basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
22modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname)) \
23 -D__KBUILD_MODNAME=$(call name-fix-token,$(modname))
24modfile_flags = -DKBUILD_MODFILE=$(call stringify,$(modfile))
25
26_c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), \
27 $(filter-out $(ccflags-remove-y), \
28 $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(ccflags-y)) \
29 $(CFLAGS_$(target-stem).o))
30_rust_flags = $(filter-out $(RUSTFLAGS_REMOVE_$(target-stem).o), \
31 $(filter-out $(rustflags-remove-y), \
32 $(KBUILD_RUSTFLAGS) $(rustflags-y)) \
33 $(RUSTFLAGS_$(target-stem).o))
34_a_flags = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), \
35 $(filter-out $(asflags-remove-y), \
36 $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(asflags-y)) \
37 $(AFLAGS_$(target-stem).o))
38_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds)
39
40#
41# Enable gcov profiling flags for a file, directory or for all files depending
42# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
43# (in this order)
44#
45ifeq ($(CONFIG_GCOV_KERNEL),y)
46_c_flags += $(if $(patsubst n%,, \
47 $(GCOV_PROFILE_$(target-stem).o)$(GCOV_PROFILE)$(if $(is-kernel-object),$(CONFIG_GCOV_PROFILE_ALL))), \
48 $(CFLAGS_GCOV))
49endif
50
51#
52# Enable address sanitizer flags for kernel except some files or directories
53# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
54#
55ifeq ($(CONFIG_KASAN),y)
56ifneq ($(CONFIG_KASAN_HW_TAGS),y)
57_c_flags += $(if $(patsubst n%,, \
58 $(KASAN_SANITIZE_$(target-stem).o)$(KASAN_SANITIZE)$(is-kernel-object)), \
59 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
60_rust_flags += $(if $(patsubst n%,, \
61 $(KASAN_SANITIZE_$(target-stem).o)$(KASAN_SANITIZE)$(is-kernel-object)), \
62 $(RUSTFLAGS_KASAN))
63endif
64endif
65
66ifeq ($(CONFIG_KMSAN),y)
67_c_flags += $(if $(patsubst n%,, \
68 $(KMSAN_SANITIZE_$(target-stem).o)$(KMSAN_SANITIZE)$(is-kernel-object)), \
69 $(CFLAGS_KMSAN))
70_c_flags += $(if $(patsubst n%,, \
71 $(KMSAN_ENABLE_CHECKS_$(target-stem).o)$(KMSAN_ENABLE_CHECKS)$(is-kernel-object)), \
72 , -mllvm -msan-disable-checks=1)
73endif
74
75ifeq ($(CONFIG_UBSAN),y)
76_c_flags += $(if $(patsubst n%,, \
77 $(UBSAN_SANITIZE_$(target-stem).o)$(UBSAN_SANITIZE)$(is-kernel-object)), \
78 $(CFLAGS_UBSAN))
79_c_flags += $(if $(patsubst n%,, \
80 $(UBSAN_INTEGER_WRAP_$(target-stem).o)$(UBSAN_SANITIZE_$(target-stem).o)$(UBSAN_INTEGER_WRAP)$(UBSAN_SANITIZE)$(is-kernel-object)), \
81 $(CFLAGS_UBSAN_INTEGER_WRAP))
82endif
83
84ifeq ($(CONFIG_KCOV),y)
85_c_flags += $(if $(patsubst n%,, \
86 $(KCOV_INSTRUMENT_$(target-stem).o)$(KCOV_INSTRUMENT)$(if $(is-kernel-object),$(CONFIG_KCOV_INSTRUMENT_ALL))), \
87 $(CFLAGS_KCOV))
88_rust_flags += $(if $(patsubst n%,, \
89 $(KCOV_INSTRUMENT_$(target-stem).o)$(KCOV_INSTRUMENT)$(if $(is-kernel-object),$(CONFIG_KCOV_INSTRUMENT_ALL))), \
90 $(RUSTFLAGS_KCOV))
91endif
92
93#
94# Enable KCSAN flags except some files or directories we don't want to check
95# (depends on variables KCSAN_SANITIZE_obj.o, KCSAN_SANITIZE)
96#
97ifeq ($(CONFIG_KCSAN),y)
98_c_flags += $(if $(patsubst n%,, \
99 $(KCSAN_SANITIZE_$(target-stem).o)$(KCSAN_SANITIZE)$(is-kernel-object)), \
100 $(CFLAGS_KCSAN))
101# Some uninstrumented files provide implied barriers required to avoid false
102# positives: set KCSAN_INSTRUMENT_BARRIERS for barrier instrumentation only.
103_c_flags += $(if $(patsubst n%,, \
104 $(KCSAN_INSTRUMENT_BARRIERS_$(target-stem).o)$(KCSAN_INSTRUMENT_BARRIERS)n), \
105 -D__KCSAN_INSTRUMENT_BARRIERS__)
106endif
107
108#
109# Enable context analysis flags only where explicitly opted in.
110# (depends on variables CONTEXT_ANALYSIS_obj.o, CONTEXT_ANALYSIS)
111#
112ifeq ($(CONFIG_WARN_CONTEXT_ANALYSIS),y)
113_c_flags += $(if $(patsubst n%,, \
114 $(CONTEXT_ANALYSIS_$(target-stem).o)$(CONTEXT_ANALYSIS)$(if $(is-kernel-object),$(CONFIG_WARN_CONTEXT_ANALYSIS_ALL))), \
115 $(CFLAGS_CONTEXT_ANALYSIS))
116endif
117
118#
119# Enable AutoFDO build flags except some files or directories we don't want to
120# enable (depends on variables AUTOFDO_PROFILE_obj.o and AUTOFDO_PROFILE).
121#
122ifeq ($(CONFIG_AUTOFDO_CLANG),y)
123_c_flags += $(if $(patsubst n%,, \
124 $(AUTOFDO_PROFILE_$(target-stem).o)$(AUTOFDO_PROFILE)$(is-kernel-object)), \
125 $(CFLAGS_AUTOFDO_CLANG))
126_rust_flags += $(if $(patsubst n%,, \
127 $(AUTOFDO_PROFILE_$(target-stem).o)$(AUTOFDO_PROFILE)$(is-kernel-object)), \
128 $(RUSTFLAGS_AUTOFDO_CLANG))
129endif
130
131#
132# Enable Propeller build flags except some files or directories we don't want to
133# enable (depends on variables AUTOFDO_PROPELLER_obj.o and PROPELLER_PROFILE).
134#
135ifdef CONFIG_PROPELLER_CLANG
136_c_flags += $(if $(patsubst n%,, \
137 $(AUTOFDO_PROFILE_$(target-stem).o)$(AUTOFDO_PROFILE)$(PROPELLER_PROFILE))$(is-kernel-object), \
138 $(CFLAGS_PROPELLER_CLANG))
139endif
140
141# $(src) for including checkin headers from generated source files
142# $(obj) for including generated headers from checkin source files
143ifdef building_out_of_srctree
144_c_flags += $(addprefix -I, $(src) $(obj))
145_a_flags += $(addprefix -I, $(src) $(obj))
146_cpp_flags += $(addprefix -I, $(src) $(obj))
147endif
148
149# If $(is-kernel-object) is 'y', this object will be linked to vmlinux or modules
150is-kernel-object = $(or $(part-of-builtin),$(part-of-module))
151
152part-of-builtin = $(if $(filter $(basename $@).o, $(real-obj-y) $(lib-y)),y)
153part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
154quiet_modtag = $(if $(part-of-module),[M], )
155
156modkern_cflags = \
157 $(if $(part-of-module), \
158 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
159 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags))
160
161modkern_rustflags = \
162 $(if $(part-of-module), \
163 $(KBUILD_RUSTFLAGS_MODULE) $(RUSTFLAGS_MODULE), \
164 $(KBUILD_RUSTFLAGS_KERNEL) $(RUSTFLAGS_KERNEL))
165
166modkern_aflags = $(if $(part-of-module), \
167 $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \
168 $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL) $(modfile_flags))
169
170c_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
171 -include $(srctree)/include/linux/compiler_types.h \
172 $(_c_flags) $(modkern_cflags) \
173 $(basename_flags) $(modname_flags)
174
175rust_flags = $(_rust_flags) $(modkern_rustflags) @$(objtree)/include/generated/rustc_cfg
176
177a_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
178 $(_a_flags) $(modkern_aflags) $(modname_flags)
179
180cpp_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
181 $(_cpp_flags)
182
183ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))
184
185ifdef CONFIG_OBJTOOL
186
187objtool := $(objtree)/tools/objtool/objtool
188
189objtool-args-$(CONFIG_HAVE_JUMP_LABEL_HACK) += --hacks=jump_label
190objtool-args-$(CONFIG_HAVE_NOINSTR_HACK) += --hacks=noinstr
191objtool-args-$(CONFIG_MITIGATION_CALL_DEPTH_TRACKING) += --hacks=skylake
192objtool-args-$(CONFIG_X86_KERNEL_IBT) += --ibt
193objtool-args-$(CONFIG_CALL_PADDING) += --prefix=$(CONFIG_FUNCTION_PADDING_BYTES)
194ifdef CONFIG_CALL_PADDING
195objtool-args-$(CONFIG_CFI) += --cfi
196objtool-args-$(CONFIG_FINEIBT) += --fineibt
197endif
198objtool-args-$(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL) += --mcount
199ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
200objtool-args-$(CONFIG_HAVE_OBJTOOL_NOP_MCOUNT) += --mnop
201endif
202objtool-args-$(CONFIG_UNWINDER_ORC) += --orc
203objtool-args-$(CONFIG_MITIGATION_RETPOLINE) += --retpoline
204objtool-args-$(CONFIG_MITIGATION_RETHUNK) += --rethunk
205objtool-args-$(CONFIG_MITIGATION_SLS) += --sls
206objtool-args-$(CONFIG_STACK_VALIDATION) += --stackval
207objtool-args-$(CONFIG_HAVE_STATIC_CALL_INLINE) += --static-call
208objtool-args-$(CONFIG_HAVE_UACCESS_VALIDATION) += --uaccess
209objtool-args-$(or $(CONFIG_GCOV_KERNEL),$(CONFIG_KCOV)) += --no-unreachable
210objtool-args-$(CONFIG_OBJTOOL_WERROR) += --werror
211
212objtool-args = $(objtool-args-y) \
213 $(if $(delay-objtool), --link) \
214 $(if $(part-of-module), --module)
215
216delay-objtool := $(or $(CONFIG_LTO_CLANG),$(CONFIG_X86_KERNEL_IBT),$(CONFIG_KLP_BUILD))
217
218cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool-args) $@)
219cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd)
220
221objtool-enabled := y
222
223endif # CONFIG_OBJTOOL
224
225# Useful for describing the dependency of composite objects
226# Usage:
227# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
228define multi_depend
229$(foreach m, $1, \
230 $(eval $m: \
231 $(addprefix $(obj)/, $(call suffix-search, $(patsubst $(obj)/%,%,$m), $2, $3))))
232endef
233
234# Remove ".." and "." from a path, without using "realpath"
235# Usage:
236# $(call normalize_path,path/to/../file)
237define normalize_path
238$(strip $(eval elements :=) \
239$(foreach elem,$(subst /, ,$1), \
240 $(if $(filter-out .,$(elem)), \
241 $(if $(filter ..,$(elem)), \
242 $(eval elements := $(wordlist 2,$(words $(elements)),x $(elements))), \
243 $(eval elements := $(elements) $(elem))))) \
244$(subst $(space),/,$(elements)))
245endef
246
247# Build commands
248# ===========================================================================
249# These are shared by some Makefile.* files.
250
251ifdef CONFIG_LTO_CLANG
252# Run $(LD) here to convert LLVM IR to ELF in the following cases:
253# - when this object needs objtool processing, as objtool cannot process LLVM IR
254# - when this is a single-object module, as modpost cannot process LLVM IR
255cmd_ld_single = $(if $(objtool-enabled)$(is-single-obj-m), ; $(LD) $(ld_flags) -r -o $(tmp-target) $@; mv $(tmp-target) $@)
256endif
257
258ifdef CONFIG_LTO_CLANG_THIN_DIST
259# Save the _c_flags, sliently.
260quiet_cmd_save_c_flags =
261 saved_c_flags = $(_c_flags) $(modkern_cflags)
262 cmd_save_c_flags = printf '\n%s\n' 'saved_c_flags_$@ := $(call escsq,$(saved_c_flags))' >> $(dot-target).cmd
263endif
264
265quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
266 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< \
267 $(cmd_ld_single) \
268 $(cmd_objtool)
269
270define rule_cc_o_c
271 $(call cmd_and_fixdep,cc_o_c)
272 $(call cmd,save_c_flags)
273 $(call cmd,checksrc)
274 $(call cmd,checkdoc)
275 $(call cmd,gen_objtooldep)
276 $(call cmd,gen_symversions_c)
277 $(call cmd,record_mcount)
278 $(call cmd,warn_shared_object)
279endef
280
281quiet_cmd_as_o_S = AS $(quiet_modtag) $@
282 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< $(cmd_objtool)
283
284define rule_as_o_S
285 $(call cmd_and_fixdep,as_o_S)
286 $(call cmd,gen_objtooldep)
287 $(call cmd,gen_symversions_S)
288 $(call cmd,warn_shared_object)
289endef
290
291# Copy a file
292# ===========================================================================
293# 'cp' preserves permissions. If you use it to copy a file in read-only srctree,
294# the copy would be read-only as well, leading to an error when executing the
295# rule next time. Use 'cat' instead in order to generate a writable file.
296quiet_cmd_copy = COPY $@
297 cmd_copy = cat $< > $@
298
299$(obj)/%: $(src)/%_shipped
300 $(call cmd,copy)
301
302# Touch a file
303# ===========================================================================
304quiet_cmd_touch = TOUCH $(call normalize_path,$@)
305 cmd_touch = touch $@
306
307# Commands useful for building a boot image
308# ===========================================================================
309#
310# Use as following:
311#
312# target: source(s) FORCE
313# $(if_changed,ld/objcopy/gzip)
314#
315# and add target to 'targets' so that we know we have to
316# read in the saved command line
317
318# Linking
319# ---------------------------------------------------------------------------
320
321quiet_cmd_ld = LD $@
322 cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@
323
324# Archive
325# ---------------------------------------------------------------------------
326
327quiet_cmd_ar = AR $@
328 cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs)
329
330# Objcopy
331# ---------------------------------------------------------------------------
332
333quiet_cmd_objcopy = OBJCOPY $@
334cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
335
336# Gzip
337# ---------------------------------------------------------------------------
338
339quiet_cmd_gzip = GZIP $@
340 cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@
341
342# Bzip2
343# ---------------------------------------------------------------------------
344
345# Bzip2 and LZMA do not include size in file... so we have to fake that;
346# append the size as a 32-bit littleendian number as gzip does.
347size_append = printf $(shell \
348dec_size=0; \
349for F in $(real-prereqs); do \
350 fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \
351 dec_size=$$(expr $$dec_size + $$fsize); \
352done; \
353printf "%08x\n" $$dec_size | \
354 sed 's/\(..\)/\1 /g' | { \
355 read ch0 ch1 ch2 ch3; \
356 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
357 printf '%s%03o' '\\' $$((0x$$ch)); \
358 done; \
359 } \
360)
361
362quiet_cmd_file_size = GEN $@
363 cmd_file_size = $(size_append) > $@
364
365quiet_cmd_bzip2 = BZIP2 $@
366 cmd_bzip2 = cat $(real-prereqs) | $(KBZIP2) -9 > $@
367
368quiet_cmd_bzip2_with_size = BZIP2 $@
369 cmd_bzip2_with_size = { cat $(real-prereqs) | $(KBZIP2) -9; $(size_append); } > $@
370
371# Lzma
372# ---------------------------------------------------------------------------
373
374quiet_cmd_lzma = LZMA $@
375 cmd_lzma = cat $(real-prereqs) | $(LZMA) -9 > $@
376
377quiet_cmd_lzma_with_size = LZMA $@
378 cmd_lzma_with_size = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@
379
380quiet_cmd_lzo = LZO $@
381 cmd_lzo = cat $(real-prereqs) | $(KLZOP) -9 > $@
382
383quiet_cmd_lzo_with_size = LZO $@
384 cmd_lzo_with_size = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@
385
386quiet_cmd_lz4 = LZ4 $@
387 cmd_lz4 = cat $(real-prereqs) | $(LZ4) -l -9 - - > $@
388
389quiet_cmd_lz4_with_size = LZ4 $@
390 cmd_lz4_with_size = { cat $(real-prereqs) | $(LZ4) -l -9 - -; \
391 $(size_append); } > $@
392
393# U-Boot mkimage
394# ---------------------------------------------------------------------------
395
396MKIMAGE := $(srctree)/scripts/mkuboot.sh
397
398# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
399# the number of overrides in arch makefiles
400UIMAGE_ARCH ?= $(SRCARCH)
401UIMAGE_COMPRESSION ?= $(or $(2),none)
402UIMAGE_OPTS-y ?=
403UIMAGE_TYPE ?= kernel
404UIMAGE_LOADADDR ?= arch_must_set_this
405UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
406UIMAGE_NAME ?= Linux-$(KERNELRELEASE)
407
408quiet_cmd_uimage = UIMAGE $@
409 cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
410 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
411 -T $(UIMAGE_TYPE) \
412 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
413 -n '$(UIMAGE_NAME)' -d $< $@
414
415# Flat Image Tree (FIT)
416# This allows for packaging of a kernel and all devicetrees files, using
417# compression.
418# ---------------------------------------------------------------------------
419
420MAKE_FIT := $(srctree)/scripts/make_fit.py
421
422# Use this to override the compression algorithm
423FIT_COMPRESSION ?= gzip
424
425quiet_cmd_fit = FIT $@
426 cmd_fit = $(MAKE_FIT) -o $@ --arch $(UIMAGE_ARCH) --os linux \
427 --name '$(UIMAGE_NAME)' $(FIT_EXTRA_ARGS) \
428 $(if $(findstring 1,$(KBUILD_VERBOSE)),-v) \
429 $(if $(FIT_DECOMPOSE_DTBS),--decompose-dtbs) \
430 --compress $(FIT_COMPRESSION) -k $< @$(word 2,$^)
431
432# XZ
433# ---------------------------------------------------------------------------
434# Use xzkern or xzkern_with_size to compress the kernel image and xzmisc to
435# compress other things.
436#
437# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
438# of the kernel decompressor. A BCJ filter is used if it is available for
439# the target architecture.
440#
441# xzkern_with_size also appends uncompressed size of the data using
442# size_append. The .xz format has the size information available at the end
443# of the file too, but it's in more complex format and it's good to avoid
444# changing the part of the boot code that reads the uncompressed size.
445# Note that the bytes added by size_append will make the xz tool think that
446# the file is corrupt. This is expected.
447#
448# xzmisc doesn't use size_append, so it can be used to create normal .xz
449# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
450# big dictionary would increase the memory usage too much in the multi-call
451# decompression mode. A BCJ filter isn't used either.
452quiet_cmd_xzkern = XZKERN $@
453 cmd_xzkern = cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh > $@
454
455quiet_cmd_xzkern_with_size = XZKERN $@
456 cmd_xzkern_with_size = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \
457 $(size_append); } > $@
458
459quiet_cmd_xzmisc = XZMISC $@
460 cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@
461
462# ZSTD
463# ---------------------------------------------------------------------------
464# Appends the uncompressed size of the data using size_append. The .zst
465# format has the size information available at the beginning of the file too,
466# but it's in a more complex format and it's good to avoid changing the part
467# of the boot code that reads the uncompressed size.
468#
469# Note that the bytes added by size_append will make the zstd tool think that
470# the file is corrupt. This is expected.
471#
472# zstd uses a maximum window size of 8 MB. zstd22 uses a maximum window size of
473# 128 MB. zstd22 is used for kernel compression because it is decompressed in a
474# single pass, so zstd doesn't need to allocate a window buffer. When streaming
475# decompression is used, like initramfs decompression, zstd22 should likely not
476# be used because it would require zstd to allocate a 128 MB buffer.
477
478quiet_cmd_zstd = ZSTD $@
479 cmd_zstd = cat $(real-prereqs) | $(ZSTD) -19 > $@
480
481quiet_cmd_zstd22 = ZSTD22 $@
482 cmd_zstd22 = cat $(real-prereqs) | $(ZSTD) -22 --ultra > $@
483
484quiet_cmd_zstd22_with_size = ZSTD22 $@
485 cmd_zstd22_with_size = { cat $(real-prereqs) | $(ZSTD) -22 --ultra; $(size_append); } > $@
486
487# ASM offsets
488# ---------------------------------------------------------------------------
489
490# Default sed regexp - multiline due to syntax constraints
491#
492# Use [:space:] because LLVM's integrated assembler inserts <tab> around
493# the .ascii directive whereas GCC keeps the <space> as-is.
494define sed-offsets
495 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
496 /^->/{s:->#\(.*\):/* \1 */:; \
497 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
498 s:->::; p;}'
499endef
500
501# Use filechk to avoid rebuilds when a header changes, but the resulting file
502# does not
503define filechk_offsets
504 echo "#ifndef $2"; \
505 echo "#define $2"; \
506 echo "/*"; \
507 echo " * DO NOT MODIFY."; \
508 echo " *"; \
509 echo " * This file was generated by Kbuild"; \
510 echo " */"; \
511 echo ""; \
512 sed -ne $(sed-offsets) < $<; \
513 echo ""; \
514 echo "#endif"
515endef