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1# Backward compatibility
2asflags-y += $(EXTRA_AFLAGS)
3ccflags-y += $(EXTRA_CFLAGS)
4cppflags-y += $(EXTRA_CPPFLAGS)
5ldflags-y += $(EXTRA_LDFLAGS)
6
7#
8# flags that take effect in sub directories
9export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y)
10export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(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
17
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
22
23lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
24
25
26# Handle objects in subdirs
27# ---------------------------------------------------------------------------
28# o if we encounter foo in $(obj-y), replace it by foo/built-in.o
29# and add the directory to the list of dirs to descend into: $(subdir-y)
30# o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
31# and add the directory to the list of dirs to descend into: $(subdir-m)
32
33# Determine modorder.
34# Unfortunately, we don't have information about ordering between -y
35# and -m subdirs. Just put -y's first.
36modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
37
38__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
39subdir-y += $(__subdir-y)
40__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
41subdir-m += $(__subdir-m)
42obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
43obj-m := $(filter-out %/, $(obj-m))
44
45# Subdirectories we need to descend into
46
47subdir-ym := $(sort $(subdir-y) $(subdir-m))
48
49# if $(foo-objs) exists, foo.o is a composite object
50multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
51multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))), $(m))))
52multi-used := $(multi-used-y) $(multi-used-m)
53single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
54
55# Build list of the parts of our composite objects, our composite
56# objects depend on those (obviously)
57multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
58multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
59multi-objs := $(multi-objs-y) $(multi-objs-m)
60
61# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
62# tell kbuild to descend
63subdir-obj-y := $(filter %/built-in.o, $(obj-y))
64
65# $(obj-dirs) is a list of directories that contain object files
66obj-dirs := $(dir $(multi-objs) $(obj-y))
67
68# Replace multi-part objects by their individual parts, look at local dir only
69real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) $(extra-y)
70real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)),$(m)))
71
72# Add subdir path
73
74extra-y := $(addprefix $(obj)/,$(extra-y))
75always := $(addprefix $(obj)/,$(always))
76targets := $(addprefix $(obj)/,$(targets))
77modorder := $(addprefix $(obj)/,$(modorder))
78obj-y := $(addprefix $(obj)/,$(obj-y))
79obj-m := $(addprefix $(obj)/,$(obj-m))
80lib-y := $(addprefix $(obj)/,$(lib-y))
81subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
82real-objs-y := $(addprefix $(obj)/,$(real-objs-y))
83real-objs-m := $(addprefix $(obj)/,$(real-objs-m))
84single-used-m := $(addprefix $(obj)/,$(single-used-m))
85multi-used-y := $(addprefix $(obj)/,$(multi-used-y))
86multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
87multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))
88multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m))
89subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
90obj-dirs := $(addprefix $(obj)/,$(obj-dirs))
91
92# These flags are needed for modversions and compiling, so we define them here
93# already
94# $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will
95# end up in (or would, if it gets compiled in)
96# Note: Files that end up in two or more modules are compiled without the
97# KBUILD_MODNAME definition. The reason is that any made-up name would
98# differ in different configs.
99name-fix = $(subst $(comma),_,$(subst -,_,$1))
100basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))"
101modname_flags = $(if $(filter 1,$(words $(modname))),\
102 -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))")
103
104orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \
105 $(ccflags-y) $(CFLAGS_$(basetarget).o)
106_c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
107orig_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
108 $(asflags-y) $(AFLAGS_$(basetarget).o)
109_a_flags = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags))
110_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
111
112#
113# Enable gcov profiling flags for a file, directory or for all files depending
114# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
115# (in this order)
116#
117ifeq ($(CONFIG_GCOV_KERNEL),y)
118_c_flags += $(if $(patsubst n%,, \
119 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
120 $(CFLAGS_GCOV))
121endif
122
123#
124# Enable address sanitizer flags for kernel except some files or directories
125# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
126#
127ifeq ($(CONFIG_KASAN),y)
128_c_flags += $(if $(patsubst n%,, \
129 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
130 $(CFLAGS_KASAN))
131endif
132
133ifeq ($(CONFIG_UBSAN),y)
134_c_flags += $(if $(patsubst n%,, \
135 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
136 $(CFLAGS_UBSAN))
137endif
138
139ifeq ($(CONFIG_KCOV),y)
140_c_flags += $(if $(patsubst n%,, \
141 $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)y), \
142 $(CFLAGS_KCOV))
143endif
144
145# If building the kernel in a separate objtree expand all occurrences
146# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
147
148ifeq ($(KBUILD_SRC),)
149__c_flags = $(_c_flags)
150__a_flags = $(_a_flags)
151__cpp_flags = $(_cpp_flags)
152else
153
154# -I$(obj) locates generated .h files
155# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
156# and locates generated .h files
157# FIXME: Replace both with specific CFLAGS* statements in the makefiles
158__c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags)
159__a_flags = $(call flags,_a_flags)
160__cpp_flags = $(call flags,_cpp_flags)
161endif
162
163c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
164 $(__c_flags) $(modkern_cflags) \
165 -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags)
166
167a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
168 $(__a_flags) $(modkern_aflags)
169
170cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
171 $(__cpp_flags)
172
173ld_flags = $(LDFLAGS) $(ldflags-y)
174
175dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \
176 -I$(srctree)/arch/$(SRCARCH)/boot/dts \
177 -I$(srctree)/arch/$(SRCARCH)/boot/dts/include \
178 -I$(srctree)/drivers/of/testcase-data \
179 -undef -D__DTS__
180
181# Finds the multi-part object the current object will be linked into
182modname-multi = $(sort $(foreach m,$(multi-used),\
183 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
184
185# Useful for describing the dependency of composite objects
186# Usage:
187# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
188define multi_depend
189$(foreach m, $(notdir $1), \
190 $(eval $(obj)/$m: \
191 $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
192endef
193
194ifdef REGENERATE_PARSERS
195
196# GPERF
197# ---------------------------------------------------------------------------
198quiet_cmd_gperf = GPERF $@
199 cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $<
200
201.PRECIOUS: $(src)/%.hash.c_shipped
202$(src)/%.hash.c_shipped: $(src)/%.gperf
203 $(call cmd,gperf)
204
205# LEX
206# ---------------------------------------------------------------------------
207LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
208
209quiet_cmd_flex = LEX $@
210 cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
211
212.PRECIOUS: $(src)/%.lex.c_shipped
213$(src)/%.lex.c_shipped: $(src)/%.l
214 $(call cmd,flex)
215
216# YACC
217# ---------------------------------------------------------------------------
218YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
219
220quiet_cmd_bison = YACC $@
221 cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
222
223.PRECIOUS: $(src)/%.tab.c_shipped
224$(src)/%.tab.c_shipped: $(src)/%.y
225 $(call cmd,bison)
226
227quiet_cmd_bison_h = YACC $@
228 cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
229
230.PRECIOUS: $(src)/%.tab.h_shipped
231$(src)/%.tab.h_shipped: $(src)/%.y
232 $(call cmd,bison_h)
233
234endif
235
236# Shipped files
237# ===========================================================================
238
239quiet_cmd_shipped = SHIPPED $@
240cmd_shipped = cat $< > $@
241
242$(obj)/%: $(src)/%_shipped
243 $(call cmd,shipped)
244
245# Commands useful for building a boot image
246# ===========================================================================
247#
248# Use as following:
249#
250# target: source(s) FORCE
251# $(if_changed,ld/objcopy/gzip)
252#
253# and add target to extra-y so that we know we have to
254# read in the saved command line
255
256# Linking
257# ---------------------------------------------------------------------------
258
259quiet_cmd_ld = LD $@
260cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
261 $(filter-out FORCE,$^) -o $@
262
263# Objcopy
264# ---------------------------------------------------------------------------
265
266quiet_cmd_objcopy = OBJCOPY $@
267cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
268
269# Gzip
270# ---------------------------------------------------------------------------
271
272quiet_cmd_gzip = GZIP $@
273cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
274 (rm -f $@ ; false)
275
276# DTC
277# ---------------------------------------------------------------------------
278DTC ?= $(objtree)/scripts/dtc/dtc
279
280# Generate an assembly file to wrap the output of the device tree compiler
281quiet_cmd_dt_S_dtb= DTB $@
282cmd_dt_S_dtb= \
283( \
284 echo '\#include <asm-generic/vmlinux.lds.h>'; \
285 echo '.section .dtb.init.rodata,"a"'; \
286 echo '.balign STRUCT_ALIGNMENT'; \
287 echo '.global __dtb_$(*F)_begin'; \
288 echo '__dtb_$(*F)_begin:'; \
289 echo '.incbin "$<" '; \
290 echo '__dtb_$(*F)_end:'; \
291 echo '.global __dtb_$(*F)_end'; \
292 echo '.balign STRUCT_ALIGNMENT'; \
293) > $@
294
295$(obj)/%.dtb.S: $(obj)/%.dtb
296 $(call cmd,dt_S_dtb)
297
298quiet_cmd_dtc = DTC $@
299cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
300 $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
301 $(DTC) -O dtb -o $@ -b 0 \
302 -i $(dir $<) $(DTC_FLAGS) \
303 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
304 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
305
306$(obj)/%.dtb: $(src)/%.dts FORCE
307 $(call if_changed_dep,dtc)
308
309dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
310
311# Bzip2
312# ---------------------------------------------------------------------------
313
314# Bzip2 and LZMA do not include size in file... so we have to fake that;
315# append the size as a 32-bit littleendian number as gzip does.
316size_append = printf $(shell \
317dec_size=0; \
318for F in $1; do \
319 fsize=$$(stat -c "%s" $$F); \
320 dec_size=$$(expr $$dec_size + $$fsize); \
321done; \
322printf "%08x\n" $$dec_size | \
323 sed 's/\(..\)/\1 /g' | { \
324 read ch0 ch1 ch2 ch3; \
325 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
326 printf '%s%03o' '\\' $$((0x$$ch)); \
327 done; \
328 } \
329)
330
331quiet_cmd_bzip2 = BZIP2 $@
332cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
333 bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
334 (rm -f $@ ; false)
335
336# Lzma
337# ---------------------------------------------------------------------------
338
339quiet_cmd_lzma = LZMA $@
340cmd_lzma = (cat $(filter-out FORCE,$^) | \
341 lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
342 (rm -f $@ ; false)
343
344quiet_cmd_lzo = LZO $@
345cmd_lzo = (cat $(filter-out FORCE,$^) | \
346 lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
347 (rm -f $@ ; false)
348
349quiet_cmd_lz4 = LZ4 $@
350cmd_lz4 = (cat $(filter-out FORCE,$^) | \
351 lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
352 (rm -f $@ ; false)
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)'
368UIMAGE_IN ?= $<
369UIMAGE_OUT ?= $@
370
371quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT)
372 cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
373 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
374 -T $(UIMAGE_TYPE) \
375 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
376 -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
377
378# XZ
379# ---------------------------------------------------------------------------
380# Use xzkern to compress the kernel image and xzmisc to compress other things.
381#
382# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
383# of the kernel decompressor. A BCJ filter is used if it is available for
384# the target architecture. xzkern also appends uncompressed size of the data
385# using size_append. The .xz format has the size information available at
386# the end of the file too, but it's in more complex format and it's good to
387# avoid changing the part of the boot code that reads the uncompressed size.
388# Note that the bytes added by size_append will make the xz tool think that
389# the file is corrupt. This is expected.
390#
391# xzmisc doesn't use size_append, so it can be used to create normal .xz
392# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
393# big dictionary would increase the memory usage too much in the multi-call
394# decompression mode. A BCJ filter isn't used either.
395quiet_cmd_xzkern = XZKERN $@
396cmd_xzkern = (cat $(filter-out FORCE,$^) | \
397 sh $(srctree)/scripts/xz_wrap.sh && \
398 $(call size_append, $(filter-out FORCE,$^))) > $@ || \
399 (rm -f $@ ; false)
400
401quiet_cmd_xzmisc = XZMISC $@
402cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
403 xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
404 (rm -f $@ ; false)
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# Subdirectories we need to descend into
24subdir-ym := $(sort $(subdir-y) $(subdir-m) \
25 $(patsubst %/,%, $(filter %/, $(obj-y) $(obj-m))))
26
27# Handle objects in subdirs:
28# - If we encounter foo in $(obj-y), replace it by foo/built-in.a and
29# foo/modules.order
30# - If we encounter foo/ in $(obj-m), replace it by foo/modules.order
31#
32# Generate modules.order to determine modorder. Unfortunately, we don't have
33# information about ordering between -y and -m subdirs. Just put -y's first.
34
35ifdef need-modorder
36obj-m := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m))
37else
38obj-m := $(filter-out %/, $(obj-m))
39endif
40
41ifdef need-builtin
42obj-y := $(patsubst %/, %/built-in.a, $(obj-y))
43else
44obj-y := $(filter-out %/, $(obj-y))
45endif
46
47# Expand $(foo-objs) $(foo-y) etc. by replacing their individuals
48suffix-search = $(strip $(foreach s, $3, $($(1:%$(strip $2)=%$s))))
49# List composite targets that are constructed by combining other targets
50multi-search = $(sort $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $m)))
51# List primitive targets that are compiled from source files
52real-search = $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $(call suffix-search, $m, $2, $3), $m))
53
54# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object
55multi-obj-y := $(call multi-search, $(obj-y), .o, -objs -y)
56multi-obj-m := $(call multi-search, $(obj-m), .o, -objs -y -m)
57multi-obj-ym := $(multi-obj-y) $(multi-obj-m)
58
59# Replace multi-part objects by their individual parts,
60# including built-in.a from subdirectories
61real-obj-y := $(call real-search, $(obj-y), .o, -objs -y)
62real-obj-m := $(call real-search, $(obj-m), .o, -objs -y -m)
63
64always-y += $(always-m)
65
66# hostprogs-always-y += foo
67# ... is a shorthand for
68# hostprogs += foo
69# always-y += foo
70hostprogs += $(hostprogs-always-y) $(hostprogs-always-m)
71always-y += $(hostprogs-always-y) $(hostprogs-always-m)
72
73# userprogs-always-y is likewise.
74userprogs += $(userprogs-always-y) $(userprogs-always-m)
75always-y += $(userprogs-always-y) $(userprogs-always-m)
76
77# DTB
78# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
79dtb-$(CONFIG_OF_ALL_DTBS) += $(dtb-)
80
81# Composite DTB (i.e. DTB constructed by overlay)
82multi-dtb-y := $(call multi-search, $(dtb-y), .dtb, -dtbs)
83# Primitive DTB compiled from *.dts
84real-dtb-y := $(call real-search, $(dtb-y), .dtb, -dtbs)
85# Base DTB that overlay is applied onto (each first word of $(*-dtbs) expansion)
86base-dtb-y := $(foreach m, $(multi-dtb-y), $(firstword $(call suffix-search, $m, .dtb, -dtbs)))
87
88always-y += $(dtb-y)
89
90ifneq ($(CHECK_DTBS),)
91always-y += $(patsubst %.dtb,%.dt.yaml, $(real-dtb-y))
92always-y += $(patsubst %.dtbo,%.dt.yaml, $(real-dtb-y))
93endif
94
95# Add subdir path
96
97extra-y := $(addprefix $(obj)/,$(extra-y))
98always-y := $(addprefix $(obj)/,$(always-y))
99targets := $(addprefix $(obj)/,$(targets))
100obj-m := $(addprefix $(obj)/,$(obj-m))
101lib-y := $(addprefix $(obj)/,$(lib-y))
102real-obj-y := $(addprefix $(obj)/,$(real-obj-y))
103real-obj-m := $(addprefix $(obj)/,$(real-obj-m))
104multi-obj-m := $(addprefix $(obj)/, $(multi-obj-m))
105multi-dtb-y := $(addprefix $(obj)/, $(multi-dtb-y))
106real-dtb-y := $(addprefix $(obj)/, $(real-dtb-y))
107subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
108
109# Finds the multi-part object the current object will be linked into.
110# If the object belongs to two or more multi-part objects, list them all.
111modname-multi = $(sort $(foreach m,$(multi-obj-ym),\
112 $(if $(filter $*.o, $(call suffix-search, $m, .o, -objs -y -m)),$(m:.o=))))
113
114__modname = $(if $(modname-multi),$(modname-multi),$(basetarget))
115
116modname = $(subst $(space),:,$(__modname))
117modfile = $(addprefix $(obj)/,$(__modname))
118
119# target with $(obj)/ and its suffix stripped
120target-stem = $(basename $(patsubst $(obj)/%,%,$@))
121
122# These flags are needed for modversions and compiling, so we define them here
123# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
124# end up in (or would, if it gets compiled in)
125name-fix-token = $(subst $(comma),_,$(subst -,_,$1))
126name-fix = $(call stringify,$(call name-fix-token,$1))
127basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
128modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname)) \
129 -D__KBUILD_MODNAME=kmod_$(call name-fix-token,$(modname))
130modfile_flags = -DKBUILD_MODFILE=$(call stringify,$(modfile))
131
132_c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), \
133 $(filter-out $(ccflags-remove-y), \
134 $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(ccflags-y)) \
135 $(CFLAGS_$(target-stem).o))
136_a_flags = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), \
137 $(filter-out $(asflags-remove-y), \
138 $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(asflags-y)) \
139 $(AFLAGS_$(target-stem).o))
140_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds)
141
142#
143# Enable gcov profiling flags for a file, directory or for all files depending
144# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
145# (in this order)
146#
147ifeq ($(CONFIG_GCOV_KERNEL),y)
148_c_flags += $(if $(patsubst n%,, \
149 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
150 $(CFLAGS_GCOV))
151endif
152
153#
154# Enable address sanitizer flags for kernel except some files or directories
155# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
156#
157ifeq ($(CONFIG_KASAN),y)
158ifneq ($(CONFIG_KASAN_HW_TAGS),y)
159_c_flags += $(if $(patsubst n%,, \
160 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
161 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
162endif
163endif
164
165ifeq ($(CONFIG_UBSAN),y)
166_c_flags += $(if $(patsubst n%,, \
167 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
168 $(CFLAGS_UBSAN))
169endif
170
171ifeq ($(CONFIG_KCOV),y)
172_c_flags += $(if $(patsubst n%,, \
173 $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
174 $(CFLAGS_KCOV))
175endif
176
177#
178# Enable KCSAN flags except some files or directories we don't want to check
179# (depends on variables KCSAN_SANITIZE_obj.o, KCSAN_SANITIZE)
180#
181ifeq ($(CONFIG_KCSAN),y)
182_c_flags += $(if $(patsubst n%,, \
183 $(KCSAN_SANITIZE_$(basetarget).o)$(KCSAN_SANITIZE)y), \
184 $(CFLAGS_KCSAN))
185endif
186
187# $(srctree)/$(src) for including checkin headers from generated source files
188# $(objtree)/$(obj) for including generated headers from checkin source files
189ifeq ($(KBUILD_EXTMOD),)
190ifdef building_out_of_srctree
191_c_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
192_a_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
193_cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
194endif
195endif
196
197part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
198quiet_modtag = $(if $(part-of-module),[M], )
199
200modkern_cflags = \
201 $(if $(part-of-module), \
202 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
203 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags))
204
205modkern_aflags = $(if $(part-of-module), \
206 $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \
207 $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL))
208
209c_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
210 -include $(srctree)/include/linux/compiler_types.h \
211 $(_c_flags) $(modkern_cflags) \
212 $(basename_flags) $(modname_flags)
213
214a_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
215 $(_a_flags) $(modkern_aflags)
216
217cpp_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
218 $(_cpp_flags)
219
220ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))
221
222DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes
223
224dtc_cpp_flags = -Wp,-MMD,$(depfile).pre.tmp -nostdinc \
225 $(addprefix -I,$(DTC_INCLUDE)) \
226 -undef -D__DTS__
227
228# Objtool arguments are also needed for modfinal with LTO, so we define
229# then here to avoid duplication.
230objtool_args = \
231 $(if $(CONFIG_UNWINDER_ORC),orc generate,check) \
232 $(if $(part-of-module), --module,) \
233 $(if $(CONFIG_FRAME_POINTER),, --no-fp) \
234 $(if $(or $(CONFIG_GCOV_KERNEL),$(CONFIG_LTO_CLANG)), \
235 --no-unreachable,) \
236 $(if $(CONFIG_RETPOLINE), --retpoline,) \
237 $(if $(CONFIG_X86_SMAP), --uaccess,) \
238 $(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount,)
239
240# Useful for describing the dependency of composite objects
241# Usage:
242# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
243define multi_depend
244$(foreach m, $(notdir $1), \
245 $(eval $(obj)/$m: \
246 $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
247endef
248
249quiet_cmd_copy = COPY $@
250 cmd_copy = cp $< $@
251
252# Shipped files
253# ===========================================================================
254# 'cp' preserves permissions. If you use it to copy a file in read-only srctree,
255# the copy would be read-only as well, leading to an error when executing the
256# rule next time. Use 'cat' instead in order to generate a writable file.
257
258quiet_cmd_shipped = SHIPPED $@
259cmd_shipped = cat $< > $@
260
261$(obj)/%: $(src)/%_shipped
262 $(call cmd,shipped)
263
264# Commands useful for building a boot image
265# ===========================================================================
266#
267# Use as following:
268#
269# target: source(s) FORCE
270# $(if_changed,ld/objcopy/gzip)
271#
272# and add target to 'targets' so that we know we have to
273# read in the saved command line
274
275# Linking
276# ---------------------------------------------------------------------------
277
278quiet_cmd_ld = LD $@
279 cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@
280
281# Archive
282# ---------------------------------------------------------------------------
283
284quiet_cmd_ar = AR $@
285 cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs)
286
287# Objcopy
288# ---------------------------------------------------------------------------
289
290quiet_cmd_objcopy = OBJCOPY $@
291cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
292
293# Gzip
294# ---------------------------------------------------------------------------
295
296quiet_cmd_gzip = GZIP $@
297 cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@
298
299# DTC
300# ---------------------------------------------------------------------------
301DTC ?= $(objtree)/scripts/dtc/dtc
302DTC_FLAGS += -Wno-interrupt_provider
303
304# Disable noisy checks by default
305ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
306DTC_FLAGS += -Wno-unit_address_vs_reg \
307 -Wno-unit_address_format \
308 -Wno-avoid_unnecessary_addr_size \
309 -Wno-alias_paths \
310 -Wno-graph_child_address \
311 -Wno-simple_bus_reg \
312 -Wno-unique_unit_address \
313 -Wno-pci_device_reg
314endif
315
316ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)
317DTC_FLAGS += -Wnode_name_chars_strict \
318 -Wproperty_name_chars_strict \
319 -Winterrupt_provider
320endif
321
322DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
323
324# Set -@ if the target is a base DTB that overlay is applied onto
325DTC_FLAGS += $(if $(filter $(patsubst $(obj)/%,%,$@), $(base-dtb-y)), -@)
326
327# Generate an assembly file to wrap the output of the device tree compiler
328quiet_cmd_dt_S_dtb= DTB $@
329cmd_dt_S_dtb= \
330{ \
331 echo '\#include <asm-generic/vmlinux.lds.h>'; \
332 echo '.section .dtb.init.rodata,"a"'; \
333 echo '.balign STRUCT_ALIGNMENT'; \
334 echo '.global __dtb_$(subst -,_,$(*F))_begin'; \
335 echo '__dtb_$(subst -,_,$(*F))_begin:'; \
336 echo '.incbin "$<" '; \
337 echo '__dtb_$(subst -,_,$(*F))_end:'; \
338 echo '.global __dtb_$(subst -,_,$(*F))_end'; \
339 echo '.balign STRUCT_ALIGNMENT'; \
340} > $@
341
342$(obj)/%.dtb.S: $(obj)/%.dtb FORCE
343 $(call if_changed,dt_S_dtb)
344
345quiet_cmd_dtc = DTC $@
346cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
347 $(DTC) -o $@ -b 0 \
348 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
349 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
350 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
351
352$(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
353 $(call if_changed_dep,dtc)
354
355$(obj)/%.dtbo: $(src)/%.dts $(DTC) FORCE
356 $(call if_changed_dep,dtc)
357
358quiet_cmd_fdtoverlay = DTOVL $@
359 cmd_fdtoverlay = $(objtree)/scripts/dtc/fdtoverlay -o $@ -i $(real-prereqs)
360
361$(multi-dtb-y): FORCE
362 $(call if_changed,fdtoverlay)
363$(call multi_depend, $(multi-dtb-y), .dtb, -dtbs)
364
365DT_CHECKER ?= dt-validate
366DT_CHECKER_FLAGS ?= $(if $(DT_SCHEMA_FILES),,-m)
367DT_BINDING_DIR := Documentation/devicetree/bindings
368# DT_TMP_SCHEMA may be overridden from Documentation/devicetree/bindings/Makefile
369DT_TMP_SCHEMA ?= $(objtree)/$(DT_BINDING_DIR)/processed-schema.json
370
371quiet_cmd_dtb_check = CHECK $@
372 cmd_dtb_check = $(DT_CHECKER) $(DT_CHECKER_FLAGS) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@
373
374define rule_dtc
375 $(call cmd_and_fixdep,dtc)
376 $(call cmd,dtb_check)
377endef
378
379$(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
380 $(call if_changed_rule,dtc)
381
382dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
383
384# Bzip2
385# ---------------------------------------------------------------------------
386
387# Bzip2 and LZMA do not include size in file... so we have to fake that;
388# append the size as a 32-bit littleendian number as gzip does.
389size_append = printf $(shell \
390dec_size=0; \
391for F in $(real-prereqs); do \
392 fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \
393 dec_size=$$(expr $$dec_size + $$fsize); \
394done; \
395printf "%08x\n" $$dec_size | \
396 sed 's/\(..\)/\1 /g' | { \
397 read ch0 ch1 ch2 ch3; \
398 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
399 printf '%s%03o' '\\' $$((0x$$ch)); \
400 done; \
401 } \
402)
403
404quiet_cmd_bzip2 = BZIP2 $@
405 cmd_bzip2 = { cat $(real-prereqs) | $(KBZIP2) -9; $(size_append); } > $@
406
407# Lzma
408# ---------------------------------------------------------------------------
409
410quiet_cmd_lzma = LZMA $@
411 cmd_lzma = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@
412
413quiet_cmd_lzo = LZO $@
414 cmd_lzo = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@
415
416quiet_cmd_lz4 = LZ4 $@
417 cmd_lz4 = { cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout; \
418 $(size_append); } > $@
419
420# U-Boot mkimage
421# ---------------------------------------------------------------------------
422
423MKIMAGE := $(srctree)/scripts/mkuboot.sh
424
425# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
426# the number of overrides in arch makefiles
427UIMAGE_ARCH ?= $(SRCARCH)
428UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
429UIMAGE_OPTS-y ?=
430UIMAGE_TYPE ?= kernel
431UIMAGE_LOADADDR ?= arch_must_set_this
432UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
433UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
434
435quiet_cmd_uimage = UIMAGE $@
436 cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
437 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
438 -T $(UIMAGE_TYPE) \
439 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
440 -n $(UIMAGE_NAME) -d $< $@
441
442# XZ
443# ---------------------------------------------------------------------------
444# Use xzkern to compress the kernel image and xzmisc to compress other things.
445#
446# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
447# of the kernel decompressor. A BCJ filter is used if it is available for
448# the target architecture. xzkern also appends uncompressed size of the data
449# using size_append. The .xz format has the size information available at
450# the end of the file too, but it's in more complex format and it's good to
451# avoid changing the part of the boot code that reads the uncompressed size.
452# Note that the bytes added by size_append will make the xz tool think that
453# the file is corrupt. This is expected.
454#
455# xzmisc doesn't use size_append, so it can be used to create normal .xz
456# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
457# big dictionary would increase the memory usage too much in the multi-call
458# decompression mode. A BCJ filter isn't used either.
459quiet_cmd_xzkern = XZKERN $@
460 cmd_xzkern = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \
461 $(size_append); } > $@
462
463quiet_cmd_xzmisc = XZMISC $@
464 cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@
465
466# ZSTD
467# ---------------------------------------------------------------------------
468# Appends the uncompressed size of the data using size_append. The .zst
469# format has the size information available at the beginning of the file too,
470# but it's in a more complex format and it's good to avoid changing the part
471# of the boot code that reads the uncompressed size.
472#
473# Note that the bytes added by size_append will make the zstd tool think that
474# the file is corrupt. This is expected.
475#
476# zstd uses a maximum window size of 8 MB. zstd22 uses a maximum window size of
477# 128 MB. zstd22 is used for kernel compression because it is decompressed in a
478# single pass, so zstd doesn't need to allocate a window buffer. When streaming
479# decompression is used, like initramfs decompression, zstd22 should likely not
480# be used because it would require zstd to allocate a 128 MB buffer.
481
482quiet_cmd_zstd = ZSTD $@
483 cmd_zstd = { cat $(real-prereqs) | $(ZSTD) -19; $(size_append); } > $@
484
485quiet_cmd_zstd22 = ZSTD22 $@
486 cmd_zstd22 = { cat $(real-prereqs) | $(ZSTD) -22 --ultra; $(size_append); } > $@
487
488# ASM offsets
489# ---------------------------------------------------------------------------
490
491# Default sed regexp - multiline due to syntax constraints
492#
493# Use [:space:] because LLVM's integrated assembler inserts <tab> around
494# the .ascii directive whereas GCC keeps the <space> as-is.
495define sed-offsets
496 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
497 /^->/{s:->#\(.*\):/* \1 */:; \
498 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
499 s:->::; p;}'
500endef
501
502# Use filechk to avoid rebuilds when a header changes, but the resulting file
503# does not
504define filechk_offsets
505 echo "#ifndef $2"; \
506 echo "#define $2"; \
507 echo "/*"; \
508 echo " * DO NOT MODIFY."; \
509 echo " *"; \
510 echo " * This file was generated by Kbuild"; \
511 echo " */"; \
512 echo ""; \
513 sed -ne $(sed-offsets) < $<; \
514 echo ""; \
515 echo "#endif"
516endef