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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))))
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=-objs)) $($(m:.o=-y)),$(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))
107_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
108 $(asflags-y) $(AFLAGS_$(basetarget).o)
109_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
110
111#
112# Enable gcov profiling flags for a file, directory or for all files depending
113# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
114# (in this order)
115#
116ifeq ($(CONFIG_GCOV_KERNEL),y)
117_c_flags += $(if $(patsubst n%,, \
118 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
119 $(CFLAGS_GCOV))
120endif
121
122# If building the kernel in a separate objtree expand all occurrences
123# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
124
125ifeq ($(KBUILD_SRC),)
126__c_flags = $(_c_flags)
127__a_flags = $(_a_flags)
128__cpp_flags = $(_cpp_flags)
129else
130
131# -I$(obj) locates generated .h files
132# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
133# and locates generated .h files
134# FIXME: Replace both with specific CFLAGS* statements in the makefiles
135__c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags)
136__a_flags = $(call flags,_a_flags)
137__cpp_flags = $(call flags,_cpp_flags)
138endif
139
140c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
141 $(__c_flags) $(modkern_cflags) \
142 -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags)
143
144a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
145 $(__a_flags) $(modkern_aflags)
146
147cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
148 $(__cpp_flags)
149
150ld_flags = $(LDFLAGS) $(ldflags-y)
151
152dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \
153 -I$(srctree)/arch/$(SRCARCH)/boot/dts \
154 -I$(srctree)/arch/$(SRCARCH)/boot/dts/include \
155 -I$(srctree)/drivers/of/testcase-data \
156 -undef -D__DTS__
157
158# Finds the multi-part object the current object will be linked into
159modname-multi = $(sort $(foreach m,$(multi-used),\
160 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
161
162ifdef REGENERATE_PARSERS
163
164# GPERF
165# ---------------------------------------------------------------------------
166quiet_cmd_gperf = GPERF $@
167 cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $<
168
169.PRECIOUS: $(src)/%.hash.c_shipped
170$(src)/%.hash.c_shipped: $(src)/%.gperf
171 $(call cmd,gperf)
172
173# LEX
174# ---------------------------------------------------------------------------
175LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
176
177quiet_cmd_flex = LEX $@
178 cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
179
180.PRECIOUS: $(src)/%.lex.c_shipped
181$(src)/%.lex.c_shipped: $(src)/%.l
182 $(call cmd,flex)
183
184# YACC
185# ---------------------------------------------------------------------------
186YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
187
188quiet_cmd_bison = YACC $@
189 cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
190
191.PRECIOUS: $(src)/%.tab.c_shipped
192$(src)/%.tab.c_shipped: $(src)/%.y
193 $(call cmd,bison)
194
195quiet_cmd_bison_h = YACC $@
196 cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
197
198.PRECIOUS: $(src)/%.tab.h_shipped
199$(src)/%.tab.h_shipped: $(src)/%.y
200 $(call cmd,bison_h)
201
202endif
203
204# Shipped files
205# ===========================================================================
206
207quiet_cmd_shipped = SHIPPED $@
208cmd_shipped = cat $< > $@
209
210$(obj)/%: $(src)/%_shipped
211 $(call cmd,shipped)
212
213# Commands useful for building a boot image
214# ===========================================================================
215#
216# Use as following:
217#
218# target: source(s) FORCE
219# $(if_changed,ld/objcopy/gzip)
220#
221# and add target to extra-y so that we know we have to
222# read in the saved command line
223
224# Linking
225# ---------------------------------------------------------------------------
226
227quiet_cmd_ld = LD $@
228cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
229 $(filter-out FORCE,$^) -o $@
230
231# Objcopy
232# ---------------------------------------------------------------------------
233
234quiet_cmd_objcopy = OBJCOPY $@
235cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
236
237# Gzip
238# ---------------------------------------------------------------------------
239
240quiet_cmd_gzip = GZIP $@
241cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
242 (rm -f $@ ; false)
243
244# DTC
245# ---------------------------------------------------------------------------
246
247# Generate an assembly file to wrap the output of the device tree compiler
248quiet_cmd_dt_S_dtb= DTB $@
249cmd_dt_S_dtb= \
250( \
251 echo '\#include <asm-generic/vmlinux.lds.h>'; \
252 echo '.section .dtb.init.rodata,"a"'; \
253 echo '.balign STRUCT_ALIGNMENT'; \
254 echo '.global __dtb_$(*F)_begin'; \
255 echo '__dtb_$(*F)_begin:'; \
256 echo '.incbin "$<" '; \
257 echo '__dtb_$(*F)_end:'; \
258 echo '.global __dtb_$(*F)_end'; \
259 echo '.balign STRUCT_ALIGNMENT'; \
260) > $@
261
262$(obj)/%.dtb.S: $(obj)/%.dtb
263 $(call cmd,dt_S_dtb)
264
265quiet_cmd_dtc = DTC $@
266cmd_dtc = $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
267 $(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 \
268 -i $(dir $<) $(DTC_FLAGS) \
269 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
270 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
271
272$(obj)/%.dtb: $(src)/%.dts FORCE
273 $(call if_changed_dep,dtc)
274
275dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
276
277# Helper targets for Installing DTBs into the boot directory
278quiet_cmd_dtb_install = INSTALL $<
279 cmd_dtb_install = cp $< $(2)
280
281_dtbinst_pre_:
282 $(Q)if [ -d $(INSTALL_DTBS_PATH).old ]; then rm -rf $(INSTALL_DTBS_PATH).old; fi
283 $(Q)if [ -d $(INSTALL_DTBS_PATH) ]; then mv $(INSTALL_DTBS_PATH) $(INSTALL_DTBS_PATH).old; fi
284 $(Q)mkdir -p $(INSTALL_DTBS_PATH)
285
286%.dtb_dtbinst_: $(obj)/%.dtb _dtbinst_pre_
287 $(call cmd,dtb_install,$(INSTALL_DTBS_PATH))
288
289# Bzip2
290# ---------------------------------------------------------------------------
291
292# Bzip2 and LZMA do not include size in file... so we have to fake that;
293# append the size as a 32-bit littleendian number as gzip does.
294size_append = printf $(shell \
295dec_size=0; \
296for F in $1; do \
297 fsize=$$(stat -c "%s" $$F); \
298 dec_size=$$(expr $$dec_size + $$fsize); \
299done; \
300printf "%08x\n" $$dec_size | \
301 sed 's/\(..\)/\1 /g' | { \
302 read ch0 ch1 ch2 ch3; \
303 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
304 printf '%s%03o' '\\' $$((0x$$ch)); \
305 done; \
306 } \
307)
308
309quiet_cmd_bzip2 = BZIP2 $@
310cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
311 bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
312 (rm -f $@ ; false)
313
314# Lzma
315# ---------------------------------------------------------------------------
316
317quiet_cmd_lzma = LZMA $@
318cmd_lzma = (cat $(filter-out FORCE,$^) | \
319 lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
320 (rm -f $@ ; false)
321
322quiet_cmd_lzo = LZO $@
323cmd_lzo = (cat $(filter-out FORCE,$^) | \
324 lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
325 (rm -f $@ ; false)
326
327quiet_cmd_lz4 = LZ4 $@
328cmd_lz4 = (cat $(filter-out FORCE,$^) | \
329 lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
330 (rm -f $@ ; false)
331
332# U-Boot mkimage
333# ---------------------------------------------------------------------------
334
335MKIMAGE := $(srctree)/scripts/mkuboot.sh
336
337# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
338# the number of overrides in arch makefiles
339UIMAGE_ARCH ?= $(SRCARCH)
340UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
341UIMAGE_OPTS-y ?=
342UIMAGE_TYPE ?= kernel
343UIMAGE_LOADADDR ?= arch_must_set_this
344UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
345UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
346UIMAGE_IN ?= $<
347UIMAGE_OUT ?= $@
348
349quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT)
350 cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
351 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
352 -T $(UIMAGE_TYPE) \
353 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
354 -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
355
356# XZ
357# ---------------------------------------------------------------------------
358# Use xzkern to compress the kernel image and xzmisc to compress other things.
359#
360# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
361# of the kernel decompressor. A BCJ filter is used if it is available for
362# the target architecture. xzkern also appends uncompressed size of the data
363# using size_append. The .xz format has the size information available at
364# the end of the file too, but it's in more complex format and it's good to
365# avoid changing the part of the boot code that reads the uncompressed size.
366# Note that the bytes added by size_append will make the xz tool think that
367# the file is corrupt. This is expected.
368#
369# xzmisc doesn't use size_append, so it can be used to create normal .xz
370# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
371# big dictionary would increase the memory usage too much in the multi-call
372# decompression mode. A BCJ filter isn't used either.
373quiet_cmd_xzkern = XZKERN $@
374cmd_xzkern = (cat $(filter-out FORCE,$^) | \
375 sh $(srctree)/scripts/xz_wrap.sh && \
376 $(call size_append, $(filter-out FORCE,$^))) > $@ || \
377 (rm -f $@ ; false)
378
379quiet_cmd_xzmisc = XZMISC $@
380cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
381 xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
382 (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# Determine modorder.
24# Unfortunately, we don't have information about ordering between -y
25# and -m subdirs. Just put -y's first.
26modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
27
28# Handle objects in subdirs
29# ---------------------------------------------------------------------------
30# o if we encounter foo in $(obj-y), replace it by foo/built-in.a
31# and add the directory to the list of dirs to descend into: $(subdir-y)
32# o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
33# and add the directory to the list of dirs to descend into: $(subdir-m)
34__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
35subdir-y += $(__subdir-y)
36__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
37subdir-m += $(__subdir-m)
38obj-y := $(patsubst %/, %/built-in.a, $(obj-y))
39obj-m := $(filter-out %/, $(obj-m))
40
41# Subdirectories we need to descend into
42subdir-ym := $(sort $(subdir-y) $(subdir-m))
43
44# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object
45multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))), $(m))))
46multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)) $($(m:.o=-))), $(m))))
47multi-used := $(multi-used-y) $(multi-used-m)
48
49# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
50# tell kbuild to descend
51subdir-obj-y := $(filter %/built-in.a, $(obj-y))
52
53# Replace multi-part objects by their individual parts,
54# including built-in.a from subdirectories
55real-obj-y := $(foreach m, $(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
56real-obj-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)) $($(m:.o=-))),$($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)),$(m)))
57
58# DTB
59# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
60extra-y += $(dtb-y)
61extra-$(CONFIG_OF_ALL_DTBS) += $(dtb-)
62
63ifneq ($(CHECK_DTBS),)
64extra-y += $(patsubst %.dtb,%.dt.yaml, $(dtb-y))
65extra-$(CONFIG_OF_ALL_DTBS) += $(patsubst %.dtb,%.dt.yaml, $(dtb-))
66endif
67
68# Test self-contained headers
69
70# Wildcard searches in $(srctree)/$(src)/, but not in $(objtree)/$(obj)/.
71# Stale generated headers are often left over, so pattern matching should
72# be avoided. Please notice $(srctree)/$(src)/ and $(objtree)/$(obj) point
73# to the same location for in-tree building. So, header-test-pattern-y should
74# be used with care.
75header-test-y += $(filter-out $(header-test-), \
76 $(patsubst $(srctree)/$(src)/%, %, \
77 $(wildcard $(addprefix $(srctree)/$(src)/, \
78 $(header-test-pattern-y)))))
79
80extra-$(CONFIG_HEADER_TEST) += $(addsuffix .s, $(header-test-y) $(header-test-m))
81
82# Add subdir path
83
84extra-y := $(addprefix $(obj)/,$(extra-y))
85always := $(addprefix $(obj)/,$(always))
86targets := $(addprefix $(obj)/,$(targets))
87modorder := $(addprefix $(obj)/,$(modorder))
88obj-m := $(addprefix $(obj)/,$(obj-m))
89lib-y := $(addprefix $(obj)/,$(lib-y))
90subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
91real-obj-y := $(addprefix $(obj)/,$(real-obj-y))
92real-obj-m := $(addprefix $(obj)/,$(real-obj-m))
93multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
94subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
95
96# Finds the multi-part object the current object will be linked into.
97# If the object belongs to two or more multi-part objects, all of them are
98# concatenated with a colon separator.
99modname-multi = $(subst $(space),:,$(sort $(foreach m,$(multi-used),\
100 $(if $(filter $*.o, $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$(m:.o=)))))
101
102modname = $(if $(modname-multi),$(modname-multi),$(basetarget))
103
104# target with $(obj)/ and its suffix stripped
105target-stem = $(basename $(patsubst $(obj)/%,%,$@))
106
107# These flags are needed for modversions and compiling, so we define them here
108# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
109# end up in (or would, if it gets compiled in)
110name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
111basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
112modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname))
113
114orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) \
115 $(ccflags-y) $(CFLAGS_$(target-stem).o)
116_c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), $(orig_c_flags))
117orig_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) \
118 $(asflags-y) $(AFLAGS_$(target-stem).o)
119_a_flags = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), $(orig_a_flags))
120_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds)
121
122#
123# Enable gcov profiling flags for a file, directory or for all files depending
124# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
125# (in this order)
126#
127ifeq ($(CONFIG_GCOV_KERNEL),y)
128_c_flags += $(if $(patsubst n%,, \
129 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
130 $(CFLAGS_GCOV))
131endif
132
133#
134# Enable address sanitizer flags for kernel except some files or directories
135# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
136#
137ifeq ($(CONFIG_KASAN),y)
138_c_flags += $(if $(patsubst n%,, \
139 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
140 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
141endif
142
143ifeq ($(CONFIG_UBSAN),y)
144_c_flags += $(if $(patsubst n%,, \
145 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
146 $(CFLAGS_UBSAN))
147endif
148
149ifeq ($(CONFIG_KCOV),y)
150_c_flags += $(if $(patsubst n%,, \
151 $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
152 $(CFLAGS_KCOV))
153endif
154
155# $(srctree)/$(src) for including checkin headers from generated source files
156# $(objtree)/$(obj) for including generated headers from checkin source files
157ifeq ($(KBUILD_EXTMOD),)
158ifdef building_out_of_srctree
159_c_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
160_a_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
161_cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
162endif
163endif
164
165part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
166quiet_modtag = $(if $(part-of-module),[M], )
167
168modkern_cflags = \
169 $(if $(part-of-module), \
170 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
171 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
172
173modkern_aflags = $(if $(part-of-module), \
174 $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \
175 $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL))
176
177c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
178 -include $(srctree)/include/linux/compiler_types.h \
179 $(_c_flags) $(modkern_cflags) \
180 $(basename_flags) $(modname_flags)
181
182a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
183 $(_a_flags) $(modkern_aflags)
184
185cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
186 $(_cpp_flags)
187
188ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))
189
190DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes
191
192dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \
193 $(addprefix -I,$(DTC_INCLUDE)) \
194 -undef -D__DTS__
195
196# Useful for describing the dependency of composite objects
197# Usage:
198# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
199define multi_depend
200$(foreach m, $(notdir $1), \
201 $(eval $(obj)/$m: \
202 $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
203endef
204
205# Shipped files
206# ===========================================================================
207
208quiet_cmd_shipped = SHIPPED $@
209cmd_shipped = cat $< > $@
210
211$(obj)/%: $(src)/%_shipped
212 $(call cmd,shipped)
213
214# Commands useful for building a boot image
215# ===========================================================================
216#
217# Use as following:
218#
219# target: source(s) FORCE
220# $(if_changed,ld/objcopy/gzip)
221#
222# and add target to extra-y so that we know we have to
223# read in the saved command line
224
225# Linking
226# ---------------------------------------------------------------------------
227
228quiet_cmd_ld = LD $@
229 cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@
230
231# Archive
232# ---------------------------------------------------------------------------
233
234quiet_cmd_ar = AR $@
235 cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs)
236
237# Objcopy
238# ---------------------------------------------------------------------------
239
240quiet_cmd_objcopy = OBJCOPY $@
241cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
242
243# Gzip
244# ---------------------------------------------------------------------------
245
246quiet_cmd_gzip = GZIP $@
247 cmd_gzip = cat $(real-prereqs) | gzip -n -f -9 > $@
248
249# DTC
250# ---------------------------------------------------------------------------
251DTC ?= $(objtree)/scripts/dtc/dtc
252
253# Disable noisy checks by default
254ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
255DTC_FLAGS += -Wno-unit_address_vs_reg \
256 -Wno-unit_address_format \
257 -Wno-avoid_unnecessary_addr_size \
258 -Wno-alias_paths \
259 -Wno-graph_child_address \
260 -Wno-simple_bus_reg \
261 -Wno-unique_unit_address \
262 -Wno-pci_device_reg
263endif
264
265ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)
266DTC_FLAGS += -Wnode_name_chars_strict \
267 -Wproperty_name_chars_strict
268endif
269
270DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
271
272# Generate an assembly file to wrap the output of the device tree compiler
273quiet_cmd_dt_S_dtb= DTB $@
274cmd_dt_S_dtb= \
275{ \
276 echo '\#include <asm-generic/vmlinux.lds.h>'; \
277 echo '.section .dtb.init.rodata,"a"'; \
278 echo '.balign STRUCT_ALIGNMENT'; \
279 echo '.global __dtb_$(subst -,_,$(*F))_begin'; \
280 echo '__dtb_$(subst -,_,$(*F))_begin:'; \
281 echo '.incbin "$<" '; \
282 echo '__dtb_$(subst -,_,$(*F))_end:'; \
283 echo '.global __dtb_$(subst -,_,$(*F))_end'; \
284 echo '.balign STRUCT_ALIGNMENT'; \
285} > $@
286
287$(obj)/%.dtb.S: $(obj)/%.dtb FORCE
288 $(call if_changed,dt_S_dtb)
289
290quiet_cmd_dtc = DTC $@
291cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
292 $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
293 $(DTC) -O $(2) -o $@ -b 0 \
294 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
295 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
296 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
297
298$(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
299 $(call if_changed_dep,dtc,dtb)
300
301DT_CHECKER ?= dt-validate
302DT_BINDING_DIR := Documentation/devicetree/bindings
303DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.yaml
304
305quiet_cmd_dtb_check = CHECK $@
306 cmd_dtb_check = $(DT_CHECKER) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ ;
307
308define rule_dtc_dt_yaml
309 $(call cmd_and_fixdep,dtc,yaml)
310 $(call cmd,dtb_check)
311endef
312
313$(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
314 $(call if_changed_rule,dtc_dt_yaml)
315
316dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
317
318# Bzip2
319# ---------------------------------------------------------------------------
320
321# Bzip2 and LZMA do not include size in file... so we have to fake that;
322# append the size as a 32-bit littleendian number as gzip does.
323size_append = printf $(shell \
324dec_size=0; \
325for F in $(real-prereqs); do \
326 fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \
327 dec_size=$$(expr $$dec_size + $$fsize); \
328done; \
329printf "%08x\n" $$dec_size | \
330 sed 's/\(..\)/\1 /g' | { \
331 read ch0 ch1 ch2 ch3; \
332 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
333 printf '%s%03o' '\\' $$((0x$$ch)); \
334 done; \
335 } \
336)
337
338quiet_cmd_bzip2 = BZIP2 $@
339 cmd_bzip2 = { cat $(real-prereqs) | bzip2 -9; $(size_append); } > $@
340
341# Lzma
342# ---------------------------------------------------------------------------
343
344quiet_cmd_lzma = LZMA $@
345 cmd_lzma = { cat $(real-prereqs) | lzma -9; $(size_append); } > $@
346
347quiet_cmd_lzo = LZO $@
348 cmd_lzo = { cat $(real-prereqs) | lzop -9; $(size_append); } > $@
349
350quiet_cmd_lz4 = LZ4 $@
351 cmd_lz4 = { cat $(real-prereqs) | lz4c -l -c1 stdin stdout; \
352 $(size_append); } > $@
353
354# U-Boot mkimage
355# ---------------------------------------------------------------------------
356
357MKIMAGE := $(srctree)/scripts/mkuboot.sh
358
359# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
360# the number of overrides in arch makefiles
361UIMAGE_ARCH ?= $(SRCARCH)
362UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
363UIMAGE_OPTS-y ?=
364UIMAGE_TYPE ?= kernel
365UIMAGE_LOADADDR ?= arch_must_set_this
366UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
367UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
368
369quiet_cmd_uimage = UIMAGE $@
370 cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
371 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
372 -T $(UIMAGE_TYPE) \
373 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
374 -n $(UIMAGE_NAME) -d $< $@
375
376# XZ
377# ---------------------------------------------------------------------------
378# Use xzkern to compress the kernel image and xzmisc to compress other things.
379#
380# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
381# of the kernel decompressor. A BCJ filter is used if it is available for
382# the target architecture. xzkern also appends uncompressed size of the data
383# using size_append. The .xz format has the size information available at
384# the end of the file too, but it's in more complex format and it's good to
385# avoid changing the part of the boot code that reads the uncompressed size.
386# Note that the bytes added by size_append will make the xz tool think that
387# the file is corrupt. This is expected.
388#
389# xzmisc doesn't use size_append, so it can be used to create normal .xz
390# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
391# big dictionary would increase the memory usage too much in the multi-call
392# decompression mode. A BCJ filter isn't used either.
393quiet_cmd_xzkern = XZKERN $@
394 cmd_xzkern = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \
395 $(size_append); } > $@
396
397quiet_cmd_xzmisc = XZMISC $@
398 cmd_xzmisc = cat $(real-prereqs) | xz --check=crc32 --lzma2=dict=1MiB > $@
399
400# ASM offsets
401# ---------------------------------------------------------------------------
402
403# Default sed regexp - multiline due to syntax constraints
404#
405# Use [:space:] because LLVM's integrated assembler inserts <tab> around
406# the .ascii directive whereas GCC keeps the <space> as-is.
407define sed-offsets
408 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
409 /^->/{s:->#\(.*\):/* \1 */:; \
410 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
411 s:->::; p;}'
412endef
413
414# Use filechk to avoid rebuilds when a header changes, but the resulting file
415# does not
416define filechk_offsets
417 echo "#ifndef $2"; \
418 echo "#define $2"; \
419 echo "/*"; \
420 echo " * DO NOT MODIFY."; \
421 echo " *"; \
422 echo " * This file was generated by Kbuild"; \
423 echo " */"; \
424 echo ""; \
425 sed -ne $(sed-offsets) < $<; \
426 echo ""; \
427 echo "#endif"
428endef