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