summaryrefslogtreecommitdiffstats
path: root/scripts/Makefile.lib
blob: 100a386fcd7173034bf6172b19fc64611a6130c1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
# SPDX-License-Identifier: GPL-2.0
# Backward compatibility
asflags-y  += $(EXTRA_AFLAGS)
ccflags-y  += $(EXTRA_CFLAGS)
cppflags-y += $(EXTRA_CPPFLAGS)
ldflags-y  += $(EXTRA_LDFLAGS)

# flags that take effect in current and sub directories
KBUILD_AFLAGS += $(subdir-asflags-y)
KBUILD_CFLAGS += $(subdir-ccflags-y)
KBUILD_RUSTFLAGS += $(subdir-rustflags-y)

# Figure out what we need to build from the various variables
# ===========================================================================

# When an object is listed to be built compiled-in and modular,
# only build the compiled-in version
obj-m := $(filter-out $(obj-y),$(obj-m))

# Libraries are always collected in one lib file.
# Filter out objects already built-in
lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))

# Subdirectories we need to descend into
subdir-ym := $(sort $(subdir-y) $(subdir-m) \
			$(patsubst %/,%, $(filter %/, $(obj-y) $(obj-m))))

# Handle objects in subdirs:
# - If we encounter foo/ in $(obj-y), replace it by foo/built-in.a and
#   foo/modules.order
# - If we encounter foo/ in $(obj-m), replace it by foo/modules.order
#
# Generate modules.order to determine modorder. Unfortunately, we don't have
# information about ordering between -y and -m subdirs. Just put -y's first.

ifdef need-modorder
obj-m := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m))
else
obj-m := $(filter-out %/, $(obj-m))
endif

ifdef need-builtin
obj-y		:= $(patsubst %/, %/built-in.a, $(obj-y))
else
obj-y		:= $(filter-out %/, $(obj-y))
endif

# Expand $(foo-objs) $(foo-y) etc. by replacing their individuals
suffix-search = $(strip $(foreach s, $3, $($(1:%$(strip $2)=%$s))))
# List composite targets that are constructed by combining other targets
multi-search = $(sort $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $m)))
# List primitive targets that are compiled from source files
real-search = $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $(call suffix-search, $m, $2, $3), $m))

# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object
multi-obj-y := $(call multi-search, $(obj-y), .o, -objs -y)
multi-obj-m := $(call multi-search, $(obj-m), .o, -objs -y -m)
multi-obj-ym := $(multi-obj-y) $(multi-obj-m)

# Replace multi-part objects by their individual parts,
# including built-in.a from subdirectories
real-obj-y := $(call real-search, $(obj-y), .o, -objs -y)
real-obj-m := $(call real-search, $(obj-m), .o, -objs -y -m)

always-y += $(always-m)

# hostprogs-always-y += foo
# ... is a shorthand for
# hostprogs += foo
# always-y  += foo
hostprogs += $(hostprogs-always-y) $(hostprogs-always-m)
always-y += $(hostprogs-always-y) $(hostprogs-always-m)

# userprogs-always-y is likewise.
userprogs += $(userprogs-always-y) $(userprogs-always-m)
always-y += $(userprogs-always-y) $(userprogs-always-m)

# DTB
# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
dtb-$(CONFIG_OF_ALL_DTBS)       += $(dtb-)

# Composite DTB (i.e. DTB constructed by overlay)
multi-dtb-y := $(call multi-search, $(dtb-y), .dtb, -dtbs)
# Primitive DTB compiled from *.dts
real-dtb-y := $(call real-search, $(dtb-y), .dtb, -dtbs)
# Base DTB that overlay is applied onto (each first word of $(*-dtbs) expansion)
base-dtb-y := $(foreach m, $(multi-dtb-y), $(firstword $(call suffix-search, $m, .dtb, -dtbs)))

always-y			+= $(dtb-y)

# Add subdir path

ifneq ($(obj),.)
extra-y		:= $(addprefix $(obj)/,$(extra-y))
always-y	:= $(addprefix $(obj)/,$(always-y))
targets		:= $(addprefix $(obj)/,$(targets))
obj-m		:= $(addprefix $(obj)/,$(obj-m))
lib-y		:= $(addprefix $(obj)/,$(lib-y))
real-obj-y	:= $(addprefix $(obj)/,$(real-obj-y))
real-obj-m	:= $(addprefix $(obj)/,$(real-obj-m))
multi-obj-m	:= $(addprefix $(obj)/, $(multi-obj-m))
multi-dtb-y	:= $(addprefix $(obj)/, $(multi-dtb-y))
real-dtb-y	:= $(addprefix $(obj)/, $(real-dtb-y))
subdir-ym	:= $(addprefix $(obj)/,$(subdir-ym))
endif

# Finds the multi-part object the current object will be linked into.
# If the object belongs to two or more multi-part objects, list them all.
modname-multi = $(sort $(foreach m,$(multi-obj-ym),\
		$(if $(filter $*.o, $(call suffix-search, $m, .o, -objs -y -m)),$(m:.o=))))

__modname = $(or $(modname-multi),$(basetarget))

modname = $(subst $(space),:,$(__modname))
modfile = $(addprefix $(obj)/,$(__modname))

# target with $(obj)/ and its suffix stripped
target-stem = $(basename $(patsubst $(obj)/%,%,$@))

# These flags are needed for modversions and compiling, so we define them here
# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
# end up in (or would, if it gets compiled in)
name-fix-token = $(subst $(comma),_,$(subst -,_,$1))
name-fix = $(call stringify,$(call name-fix-token,$1))
basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
modname_flags  = -DKBUILD_MODNAME=$(call name-fix,$(modname)) \
		 -D__KBUILD_MODNAME=kmod_$(call name-fix-token,$(modname))
modfile_flags  = -DKBUILD_MODFILE=$(call stringify,$(modfile))

_c_flags       = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), \
                     $(filter-out $(ccflags-remove-y), \
                         $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(ccflags-y)) \
                     $(CFLAGS_$(target-stem).o))
_rust_flags    = $(filter-out $(RUSTFLAGS_REMOVE_$(target-stem).o), \
                     $(filter-out $(rustflags-remove-y), \
                         $(KBUILD_RUSTFLAGS) $(rustflags-y)) \
                     $(RUSTFLAGS_$(target-stem).o))
_a_flags       = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), \
                     $(filter-out $(asflags-remove-y), \
                         $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(asflags-y)) \
                     $(AFLAGS_$(target-stem).o))
_cpp_flags     = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds)

#
# Enable gcov profiling flags for a file, directory or for all files depending
# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
# (in this order)
#
ifeq ($(CONFIG_GCOV_KERNEL),y)
_c_flags += $(if $(patsubst n%,, \
		$(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
		$(CFLAGS_GCOV))
endif

#
# Enable address sanitizer flags for kernel except some files or directories
# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
#
ifeq ($(CONFIG_KASAN),y)
ifneq ($(CONFIG_KASAN_HW_TAGS),y)
_c_flags += $(if $(patsubst n%,, \
		$(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
		$(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
endif
endif

ifeq ($(CONFIG_KMSAN),y)
_c_flags += $(if $(patsubst n%,, \
		$(KMSAN_SANITIZE_$(basetarget).o)$(KMSAN_SANITIZE)y), \
		$(CFLAGS_KMSAN))
_c_flags += $(if $(patsubst n%,, \
		$(KMSAN_ENABLE_CHECKS_$(basetarget).o)$(KMSAN_ENABLE_CHECKS)y), \
		, -mllvm -msan-disable-checks=1)
endif

ifeq ($(CONFIG_UBSAN),y)
_c_flags += $(if $(patsubst n%,, \
		$(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
		$(CFLAGS_UBSAN))
endif

ifeq ($(CONFIG_KCOV),y)
_c_flags += $(if $(patsubst n%,, \
	$(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
	$(CFLAGS_KCOV))
endif

#
# Enable KCSAN flags except some files or directories we don't want to check
# (depends on variables KCSAN_SANITIZE_obj.o, KCSAN_SANITIZE)
#
ifeq ($(CONFIG_KCSAN),y)
_c_flags += $(if $(patsubst n%,, \
	$(KCSAN_SANITIZE_$(basetarget).o)$(KCSAN_SANITIZE)y), \
	$(CFLAGS_KCSAN))
# Some uninstrumented files provide implied barriers required to avoid false
# positives: set KCSAN_INSTRUMENT_BARRIERS for barrier instrumentation only.
_c_flags += $(if $(patsubst n%,, \
	$(KCSAN_INSTRUMENT_BARRIERS_$(basetarget).o)$(KCSAN_INSTRUMENT_BARRIERS)n), \
	-D__KCSAN_INSTRUMENT_BARRIERS__)
endif

# $(srctree)/$(src) for including checkin headers from generated source files
# $(objtree)/$(obj) for including generated headers from checkin source files
ifeq ($(KBUILD_EXTMOD),)
ifdef building_out_of_srctree
_c_flags   += -I $(srctree)/$(src) -I $(objtree)/$(obj)
_a_flags   += -I $(srctree)/$(src) -I $(objtree)/$(obj)
_cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
endif
endif

part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
quiet_modtag = $(if $(part-of-module),[M],   )

modkern_cflags =                                          \
	$(if $(part-of-module),                           \
		$(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
		$(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags))

modkern_rustflags =                                              \
	$(if $(part-of-module),                                   \
		$(KBUILD_RUSTFLAGS_MODULE) $(RUSTFLAGS_MODULE), \
		$(KBUILD_RUSTFLAGS_KERNEL) $(RUSTFLAGS_KERNEL))

modkern_aflags = $(if $(part-of-module),				\
			$(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE),	\
			$(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL))

c_flags        = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
		 -include $(srctree)/include/linux/compiler_types.h       \
		 $(_c_flags) $(modkern_cflags)                           \
		 $(basename_flags) $(modname_flags)

rust_flags     = $(_rust_flags) $(modkern_rustflags) @$(objtree)/include/generated/rustc_cfg

a_flags        = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
		 $(_a_flags) $(modkern_aflags)

cpp_flags      = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
		 $(_cpp_flags)

ld_flags       = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))

DTC_INCLUDE    := $(srctree)/scripts/dtc/include-prefixes

dtc_cpp_flags  = -Wp,-MMD,$(depfile).pre.tmp -nostdinc                    \
		 $(addprefix -I,$(DTC_INCLUDE))                          \
		 -undef -D__DTS__

ifdef CONFIG_OBJTOOL

objtool := $(objtree)/tools/objtool/objtool

objtool-args-$(CONFIG_HAVE_JUMP_LABEL_HACK)		+= --hacks=jump_label
objtool-args-$(CONFIG_HAVE_NOINSTR_HACK)		+= --hacks=noinstr
objtool-args-$(CONFIG_CALL_DEPTH_TRACKING)		+= --hacks=skylake
objtool-args-$(CONFIG_X86_KERNEL_IBT)			+= --ibt
objtool-args-$(CONFIG_FINEIBT)				+= --cfi
objtool-args-$(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL)	+= --mcount
ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
objtool-args-$(CONFIG_HAVE_OBJTOOL_NOP_MCOUNT)		+= --mnop
endif
objtool-args-$(CONFIG_UNWINDER_ORC)			+= --orc
objtool-args-$(CONFIG_RETPOLINE)			+= --retpoline
objtool-args-$(CONFIG_RETHUNK)				+= --rethunk
objtool-args-$(CONFIG_SLS)				+= --sls
objtool-args-$(CONFIG_STACK_VALIDATION)			+= --stackval
objtool-args-$(CONFIG_HAVE_STATIC_CALL_INLINE)		+= --static-call
objtool-args-$(CONFIG_HAVE_UACCESS_VALIDATION)		+= --uaccess
objtool-args-$(CONFIG_GCOV_KERNEL)			+= --no-unreachable
objtool-args-$(CONFIG_PREFIX_SYMBOLS)			+= --prefix=$(CONFIG_FUNCTION_PADDING_BYTES)

objtool-args = $(objtool-args-y)					\
	$(if $(delay-objtool), --link)					\
	$(if $(part-of-module), --module)

delay-objtool := $(or $(CONFIG_LTO_CLANG),$(CONFIG_X86_KERNEL_IBT))

cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool-args) $@)
cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd)

endif # CONFIG_OBJTOOL

# Useful for describing the dependency of composite objects
# Usage:
#   $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
define multi_depend
$(foreach m, $1, \
	$(eval $m: \
	$(addprefix $(obj)/, $(call suffix-search, $(patsubst $(obj)/%,%,$m), $2, $3))))
endef

# Copy a file
# ===========================================================================
# 'cp' preserves permissions. If you use it to copy a file in read-only srctree,
# the copy would be read-only as well, leading to an error when executing the
# rule next time. Use 'cat' instead in order to generate a writable file.
quiet_cmd_copy = COPY    $@
      cmd_copy = cat $< > $@

$(obj)/%: $(src)/%_shipped
	$(call cmd,copy)

# Commands useful for building a boot image
# ===========================================================================
#
#	Use as following:
#
#	target: source(s) FORCE
#		$(if_changed,ld/objcopy/gzip)
#
#	and add target to 'targets' so that we know we have to
#	read in the saved command line

# Linking
# ---------------------------------------------------------------------------

quiet_cmd_ld = LD      $@
      cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@

# Archive
# ---------------------------------------------------------------------------

quiet_cmd_ar = AR      $@
      cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs)

# Objcopy
# ---------------------------------------------------------------------------

quiet_cmd_objcopy = OBJCOPY $@
cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@

# Gzip
# ---------------------------------------------------------------------------

quiet_cmd_gzip = GZIP    $@
      cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@

# DTC
# ---------------------------------------------------------------------------
DTC ?= $(objtree)/scripts/dtc/dtc
DTC_FLAGS += -Wno-interrupt_provider \
	-Wno-unique_unit_address

# Disable noisy checks by default
ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
DTC_FLAGS += -Wno-unit_address_vs_reg \
	-Wno-avoid_unnecessary_addr_size \
	-Wno-alias_paths \
	-Wno-graph_child_address \
	-Wno-simple_bus_reg
else
DTC_FLAGS += \
        -Wunique_unit_address_if_enabled
endif

ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)
DTC_FLAGS += -Wnode_name_chars_strict \
	-Wproperty_name_chars_strict \
	-Winterrupt_provider \
	-Wunique_unit_address
endif

DTC_FLAGS += $(DTC_FLAGS_$(basetarget))

# Set -@ if the target is a base DTB that overlay is applied onto
DTC_FLAGS += $(if $(filter $(patsubst $(obj)/%,%,$@), $(base-dtb-y)), -@)

# Generate an assembly file to wrap the output of the device tree compiler
quiet_cmd_wrap_S_dtb = WRAP    $@
      cmd_wrap_S_dtb = {								\
		symbase=__$(patsubst .%,%,$(suffix $<))_$(subst -,_,$(notdir $*));	\
		echo '\#include <asm-generic/vmlinux.lds.h>';				\
		echo '.section .dtb.init.rodata,"a"';					\
		echo '.balign STRUCT_ALIGNMENT';					\
		echo ".global $${symbase}_begin";					\
		echo "$${symbase}_begin:";						\
		echo '.incbin "$<" ';							\
		echo ".global $${symbase}_end";						\
		echo "$${symbase}_end:";						\
		echo '.balign STRUCT_ALIGNMENT';					\
	} > $@

$(obj)/%.dtb.S: $(obj)/%.dtb FORCE
	$(call if_changed,wrap_S_dtb)

$(obj)/%.dtbo.S: $(obj)/%.dtbo FORCE
	$(call if_changed,wrap_S_dtb)

quiet_cmd_dtc = DTC     $@
cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
	$(DTC) -o $@ -b 0 \
		$(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
		-d $(depfile).dtc.tmp $(dtc-tmp) ; \
	cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)

quiet_cmd_fdtoverlay = DTOVL   $@
      cmd_fdtoverlay = $(objtree)/scripts/dtc/fdtoverlay -o $@ -i $(real-prereqs)

$(multi-dtb-y): FORCE
	$(call if_changed,fdtoverlay)
$(call multi_depend, $(multi-dtb-y), .dtb, -dtbs)

ifneq ($(CHECK_DTBS)$(CHECK_DT_BINDING),)
DT_CHECKER ?= dt-validate
DT_CHECKER_FLAGS ?= $(if $(DT_SCHEMA_FILES),-l $(DT_SCHEMA_FILES),-m)
DT_BINDING_DIR := Documentation/devicetree/bindings
DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.json

quiet_cmd_dtb =	DTC_CHK $@
      cmd_dtb =	$(cmd_dtc) ; $(DT_CHECKER) $(DT_CHECKER_FLAGS) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ || true
else
quiet_cmd_dtb = $(quiet_cmd_dtc)
      cmd_dtb = $(cmd_dtc)
endif

$(obj)/%.dtb: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
	$(call if_changed_dep,dtb)

$(obj)/%.dtbo: $(src)/%.dts $(DTC) FORCE
	$(call if_changed_dep,dtc)

$(obj)/%.dtbo: $(src)/%.dtso $(DTC) FORCE
	$(call if_changed_dep,dtc)

dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)

# Bzip2
# ---------------------------------------------------------------------------

# Bzip2 and LZMA do not include size in file... so we have to fake that;
# append the size as a 32-bit littleendian number as gzip does.
size_append = printf $(shell						\
dec_size=0;								\
for F in $(real-prereqs); do					\
	fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F);	\
	dec_size=$$(expr $$dec_size + $$fsize);				\
done;									\
printf "%08x\n" $$dec_size |						\
	sed 's/\(..\)/\1 /g' | {					\
		read ch0 ch1 ch2 ch3;					\
		for ch in $$ch3 $$ch2 $$ch1 $$ch0; do			\
			printf '%s%03o' '\\' $$((0x$$ch)); 		\
		done;							\
	}								\
)

quiet_cmd_file_size = GEN     $@
      cmd_file_size = $(size_append) > $@

quiet_cmd_bzip2 = BZIP2   $@
      cmd_bzip2 = cat $(real-prereqs) | $(KBZIP2) -9 > $@

quiet_cmd_bzip2_with_size = BZIP2   $@
      cmd_bzip2_with_size = { cat $(real-prereqs) | $(KBZIP2) -9; $(size_append); } > $@

# Lzma
# ---------------------------------------------------------------------------

quiet_cmd_lzma = LZMA    $@
      cmd_lzma = cat $(real-prereqs) | $(LZMA) -9 > $@

quiet_cmd_lzma_with_size = LZMA    $@
      cmd_lzma_with_size = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@

quiet_cmd_lzo = LZO     $@
      cmd_lzo = cat $(real-prereqs) | $(KLZOP) -9 > $@

quiet_cmd_lzo_with_size = LZO     $@
      cmd_lzo_with_size = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@

quiet_cmd_lz4 = LZ4     $@
      cmd_lz4 = cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout > $@

quiet_cmd_lz4_with_size = LZ4     $@
      cmd_lz4_with_size = { cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout; \
                  $(size_append); } > $@

# U-Boot mkimage
# ---------------------------------------------------------------------------

MKIMAGE := $(srctree)/scripts/mkuboot.sh

# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
# the number of overrides in arch makefiles
UIMAGE_ARCH ?= $(SRCARCH)
UIMAGE_COMPRESSION ?= $(or $(2),none)
UIMAGE_OPTS-y ?=
UIMAGE_TYPE ?= kernel
UIMAGE_LOADADDR ?= arch_must_set_this
UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'

quiet_cmd_uimage = UIMAGE  $@
      cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
			-C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
			-T $(UIMAGE_TYPE) \
			-a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
			-n $(UIMAGE_NAME) -d $< $@

# XZ
# ---------------------------------------------------------------------------
# Use xzkern to compress the kernel image and xzmisc to compress other things.
#
# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
# of the kernel decompressor. A BCJ filter is used if it is available for
# the target architecture. xzkern also appends uncompressed size of the data
# using size_append. The .xz format has the size information available at
# the end of the file too, but it's in more complex format and it's good to
# avoid changing the part of the boot code that reads the uncompressed size.
# Note that the bytes added by size_append will make the xz tool think that
# the file is corrupt. This is expected.
#
# xzmisc doesn't use size_append, so it can be used to create normal .xz
# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
# big dictionary would increase the memory usage too much in the multi-call
# decompression mode. A BCJ filter isn't used either.
quiet_cmd_xzkern = XZKERN  $@
      cmd_xzkern = cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh > $@

quiet_cmd_xzkern_with_size = XZKERN  $@
      cmd_xzkern_with_size = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \
                     $(size_append); } > $@

quiet_cmd_xzmisc = XZMISC  $@
      cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@

# ZSTD
# ---------------------------------------------------------------------------
# Appends the uncompressed size of the data using size_append. The .zst
# format has the size information available at the beginning of the file too,
# but it's in a more complex format and it's good to avoid changing the part
# of the boot code that reads the uncompressed size.
#
# Note that the bytes added by size_append will make the zstd tool think that
# the file is corrupt. This is expected.
#
# zstd uses a maximum window size of 8 MB. zstd22 uses a maximum window size of
# 128 MB. zstd22 is used for kernel compression because it is decompressed in a
# single pass, so zstd doesn't need to allocate a window buffer. When streaming
# decompression is used, like initramfs decompression, zstd22 should likely not
# be used because it would require zstd to allocate a 128 MB buffer.

quiet_cmd_zstd = ZSTD    $@
      cmd_zstd = cat $(real-prereqs) | $(ZSTD) -19 > $@

quiet_cmd_zstd22 = ZSTD22  $@
      cmd_zstd22 = cat $(real-prereqs) | $(ZSTD) -22 --ultra > $@

quiet_cmd_zstd22_with_size = ZSTD22  $@
      cmd_zstd22_with_size = { cat $(real-prereqs) | $(ZSTD) -22 --ultra; $(size_append); } > $@

# ASM offsets
# ---------------------------------------------------------------------------

# Default sed regexp - multiline due to syntax constraints
#
# Use [:space:] because LLVM's integrated assembler inserts <tab> around
# the .ascii directive whereas GCC keeps the <space> as-is.
define sed-offsets
	's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
	/^->/{s:->#\(.*\):/* \1 */:; \
	s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
	s:->::; p;}'
endef

# Use filechk to avoid rebuilds when a header changes, but the resulting file
# does not
define filechk_offsets
	 echo "#ifndef $2"; \
	 echo "#define $2"; \
	 echo "/*"; \
	 echo " * DO NOT MODIFY."; \
	 echo " *"; \
	 echo " * This file was generated by Kbuild"; \
	 echo " */"; \
	 echo ""; \
	 sed -ne $(sed-offsets) < $<; \
	 echo ""; \
	 echo "#endif"
endef