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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)
11KBUILD_RUSTFLAGS += $(subdir-rustflags-y)
12
13# Figure out what we need to build from the various variables
14# ===========================================================================
15
16# When an object is listed to be built compiled-in and modular,
17# only build the compiled-in version
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
22lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
23
24# Subdirectories we need to descend into
25subdir-ym := $(sort $(subdir-y) $(subdir-m) \
26 $(patsubst %/,%, $(filter %/, $(obj-y) $(obj-m))))
27
28# Handle objects in subdirs:
29# - If we encounter foo in $(obj-y), replace it by foo/built-in.a and
30# foo/modules.order
31# - If we encounter foo/ in $(obj-m), replace it by foo/modules.order
32#
33# Generate modules.order to determine modorder. Unfortunately, we don't have
34# information about ordering between -y and -m subdirs. Just put -y's first.
35
36ifdef need-modorder
37obj-m := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m))
38else
39obj-m := $(filter-out %/, $(obj-m))
40endif
41
42ifdef need-builtin
43obj-y := $(patsubst %/, %/built-in.a, $(obj-y))
44else
45obj-y := $(filter-out %/, $(obj-y))
46endif
47
48# Expand $(foo-objs) $(foo-y) etc. by replacing their individuals
49suffix-search = $(strip $(foreach s, $3, $($(1:%$(strip $2)=%$s))))
50# List composite targets that are constructed by combining other targets
51multi-search = $(sort $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $m)))
52# List primitive targets that are compiled from source files
53real-search = $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $(call suffix-search, $m, $2, $3), $m))
54
55# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object
56multi-obj-y := $(call multi-search, $(obj-y), .o, -objs -y)
57multi-obj-m := $(call multi-search, $(obj-m), .o, -objs -y -m)
58multi-obj-ym := $(multi-obj-y) $(multi-obj-m)
59
60# Replace multi-part objects by their individual parts,
61# including built-in.a from subdirectories
62real-obj-y := $(call real-search, $(obj-y), .o, -objs -y)
63real-obj-m := $(call real-search, $(obj-m), .o, -objs -y -m)
64
65always-y += $(always-m)
66
67# hostprogs-always-y += foo
68# ... is a shorthand for
69# hostprogs += foo
70# always-y += foo
71hostprogs += $(hostprogs-always-y) $(hostprogs-always-m)
72always-y += $(hostprogs-always-y) $(hostprogs-always-m)
73
74# userprogs-always-y is likewise.
75userprogs += $(userprogs-always-y) $(userprogs-always-m)
76always-y += $(userprogs-always-y) $(userprogs-always-m)
77
78# DTB
79# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
80dtb-$(CONFIG_OF_ALL_DTBS) += $(dtb-)
81
82# Composite DTB (i.e. DTB constructed by overlay)
83multi-dtb-y := $(call multi-search, $(dtb-y), .dtb, -dtbs)
84# Primitive DTB compiled from *.dts
85real-dtb-y := $(call real-search, $(dtb-y), .dtb, -dtbs)
86# Base DTB that overlay is applied onto
87base-dtb-y := $(filter %.dtb, $(call real-search, $(multi-dtb-y), .dtb, -dtbs))
88
89always-y += $(dtb-y)
90
91# Add subdir path
92
93ifneq ($(obj),.)
94extra-y := $(addprefix $(obj)/,$(extra-y))
95always-y := $(addprefix $(obj)/,$(always-y))
96targets := $(addprefix $(obj)/,$(targets))
97obj-m := $(addprefix $(obj)/,$(obj-m))
98lib-y := $(addprefix $(obj)/,$(lib-y))
99real-obj-y := $(addprefix $(obj)/,$(real-obj-y))
100real-obj-m := $(addprefix $(obj)/,$(real-obj-m))
101multi-obj-m := $(addprefix $(obj)/, $(multi-obj-m))
102multi-dtb-y := $(addprefix $(obj)/, $(multi-dtb-y))
103real-dtb-y := $(addprefix $(obj)/, $(real-dtb-y))
104subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
105endif
106
107# Finds the multi-part object the current object will be linked into.
108# If the object belongs to two or more multi-part objects, list them all.
109modname-multi = $(sort $(foreach m,$(multi-obj-ym),\
110 $(if $(filter $*.o, $(call suffix-search, $m, .o, -objs -y -m)),$(m:.o=))))
111
112__modname = $(or $(modname-multi),$(basetarget))
113
114modname = $(subst $(space),:,$(__modname))
115modfile = $(addprefix $(obj)/,$(__modname))
116
117# target with $(obj)/ and its suffix stripped
118target-stem = $(basename $(patsubst $(obj)/%,%,$@))
119
120# These flags are needed for modversions and compiling, so we define them here
121# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
122# end up in (or would, if it gets compiled in)
123name-fix-token = $(subst $(comma),_,$(subst -,_,$1))
124name-fix = $(call stringify,$(call name-fix-token,$1))
125basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
126modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname)) \
127 -D__KBUILD_MODNAME=kmod_$(call name-fix-token,$(modname))
128modfile_flags = -DKBUILD_MODFILE=$(call stringify,$(modfile))
129
130_c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), \
131 $(filter-out $(ccflags-remove-y), \
132 $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(ccflags-y)) \
133 $(CFLAGS_$(target-stem).o))
134_rust_flags = $(filter-out $(RUSTFLAGS_REMOVE_$(target-stem).o), \
135 $(filter-out $(rustflags-remove-y), \
136 $(KBUILD_RUSTFLAGS) $(rustflags-y)) \
137 $(RUSTFLAGS_$(target-stem).o))
138_a_flags = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), \
139 $(filter-out $(asflags-remove-y), \
140 $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(asflags-y)) \
141 $(AFLAGS_$(target-stem).o))
142_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds)
143
144#
145# Enable gcov profiling flags for a file, directory or for all files depending
146# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
147# (in this order)
148#
149ifeq ($(CONFIG_GCOV_KERNEL),y)
150_c_flags += $(if $(patsubst n%,, \
151 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
152 $(CFLAGS_GCOV))
153endif
154
155#
156# Enable address sanitizer flags for kernel except some files or directories
157# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
158#
159ifeq ($(CONFIG_KASAN),y)
160ifneq ($(CONFIG_KASAN_HW_TAGS),y)
161_c_flags += $(if $(patsubst n%,, \
162 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
163 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
164endif
165endif
166
167ifeq ($(CONFIG_KMSAN),y)
168_c_flags += $(if $(patsubst n%,, \
169 $(KMSAN_SANITIZE_$(basetarget).o)$(KMSAN_SANITIZE)y), \
170 $(CFLAGS_KMSAN))
171_c_flags += $(if $(patsubst n%,, \
172 $(KMSAN_ENABLE_CHECKS_$(basetarget).o)$(KMSAN_ENABLE_CHECKS)y), \
173 , -mllvm -msan-disable-checks=1)
174endif
175
176ifeq ($(CONFIG_UBSAN),y)
177_c_flags += $(if $(patsubst n%,, \
178 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
179 $(CFLAGS_UBSAN))
180endif
181
182ifeq ($(CONFIG_KCOV),y)
183_c_flags += $(if $(patsubst n%,, \
184 $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
185 $(CFLAGS_KCOV))
186endif
187
188#
189# Enable KCSAN flags except some files or directories we don't want to check
190# (depends on variables KCSAN_SANITIZE_obj.o, KCSAN_SANITIZE)
191#
192ifeq ($(CONFIG_KCSAN),y)
193_c_flags += $(if $(patsubst n%,, \
194 $(KCSAN_SANITIZE_$(basetarget).o)$(KCSAN_SANITIZE)y), \
195 $(CFLAGS_KCSAN))
196# Some uninstrumented files provide implied barriers required to avoid false
197# positives: set KCSAN_INSTRUMENT_BARRIERS for barrier instrumentation only.
198_c_flags += $(if $(patsubst n%,, \
199 $(KCSAN_INSTRUMENT_BARRIERS_$(basetarget).o)$(KCSAN_INSTRUMENT_BARRIERS)n), \
200 -D__KCSAN_INSTRUMENT_BARRIERS__)
201endif
202
203# $(srctree)/$(src) for including checkin headers from generated source files
204# $(objtree)/$(obj) for including generated headers from checkin source files
205ifeq ($(KBUILD_EXTMOD),)
206ifdef building_out_of_srctree
207_c_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
208_a_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
209_cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
210endif
211endif
212
213part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
214quiet_modtag = $(if $(part-of-module),[M], )
215
216modkern_cflags = \
217 $(if $(part-of-module), \
218 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
219 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags))
220
221modkern_rustflags = \
222 $(if $(part-of-module), \
223 $(KBUILD_RUSTFLAGS_MODULE) $(RUSTFLAGS_MODULE), \
224 $(KBUILD_RUSTFLAGS_KERNEL) $(RUSTFLAGS_KERNEL))
225
226modkern_aflags = $(if $(part-of-module), \
227 $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \
228 $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL))
229
230c_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
231 -include $(srctree)/include/linux/compiler_types.h \
232 $(_c_flags) $(modkern_cflags) \
233 $(basename_flags) $(modname_flags)
234
235rust_flags = $(_rust_flags) $(modkern_rustflags) @$(objtree)/include/generated/rustc_cfg
236
237a_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
238 $(_a_flags) $(modkern_aflags)
239
240cpp_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
241 $(_cpp_flags)
242
243ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))
244
245DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes
246
247dtc_cpp_flags = -Wp,-MMD,$(depfile).pre.tmp -nostdinc \
248 $(addprefix -I,$(DTC_INCLUDE)) \
249 -undef -D__DTS__
250
251ifdef CONFIG_OBJTOOL
252
253objtool := $(objtree)/tools/objtool/objtool
254
255objtool-args-$(CONFIG_HAVE_JUMP_LABEL_HACK) += --hacks=jump_label
256objtool-args-$(CONFIG_HAVE_NOINSTR_HACK) += --hacks=noinstr
257objtool-args-$(CONFIG_CALL_DEPTH_TRACKING) += --hacks=skylake
258objtool-args-$(CONFIG_X86_KERNEL_IBT) += --ibt
259objtool-args-$(CONFIG_FINEIBT) += --cfi
260objtool-args-$(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL) += --mcount
261ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
262objtool-args-$(CONFIG_HAVE_OBJTOOL_NOP_MCOUNT) += --mnop
263endif
264objtool-args-$(CONFIG_UNWINDER_ORC) += --orc
265objtool-args-$(CONFIG_RETPOLINE) += --retpoline
266objtool-args-$(CONFIG_RETHUNK) += --rethunk
267objtool-args-$(CONFIG_SLS) += --sls
268objtool-args-$(CONFIG_STACK_VALIDATION) += --stackval
269objtool-args-$(CONFIG_HAVE_STATIC_CALL_INLINE) += --static-call
270objtool-args-$(CONFIG_HAVE_UACCESS_VALIDATION) += --uaccess
271objtool-args-$(CONFIG_GCOV_KERNEL) += --no-unreachable
272objtool-args-$(CONFIG_PREFIX_SYMBOLS) += --prefix=$(CONFIG_FUNCTION_PADDING_BYTES)
273
274objtool-args = $(objtool-args-y) \
275 $(if $(delay-objtool), --link) \
276 $(if $(part-of-module), --module)
277
278delay-objtool := $(or $(CONFIG_LTO_CLANG),$(CONFIG_X86_KERNEL_IBT))
279
280cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool-args) $@)
281cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd)
282
283endif # CONFIG_OBJTOOL
284
285# Useful for describing the dependency of composite objects
286# Usage:
287# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
288define multi_depend
289$(foreach m, $1, \
290 $(eval $m: \
291 $(addprefix $(obj)/, $(call suffix-search, $(patsubst $(obj)/%,%,$m), $2, $3))))
292endef
293
294# Copy a file
295# ===========================================================================
296# 'cp' preserves permissions. If you use it to copy a file in read-only srctree,
297# the copy would be read-only as well, leading to an error when executing the
298# rule next time. Use 'cat' instead in order to generate a writable file.
299quiet_cmd_copy = COPY $@
300 cmd_copy = cat $< > $@
301
302$(obj)/%: $(src)/%_shipped
303 $(call cmd,copy)
304
305# Commands useful for building a boot image
306# ===========================================================================
307#
308# Use as following:
309#
310# target: source(s) FORCE
311# $(if_changed,ld/objcopy/gzip)
312#
313# and add target to 'targets' so that we know we have to
314# read in the saved command line
315
316# Linking
317# ---------------------------------------------------------------------------
318
319quiet_cmd_ld = LD $@
320 cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@
321
322# Archive
323# ---------------------------------------------------------------------------
324
325quiet_cmd_ar = AR $@
326 cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs)
327
328# Objcopy
329# ---------------------------------------------------------------------------
330
331quiet_cmd_objcopy = OBJCOPY $@
332cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
333
334# Gzip
335# ---------------------------------------------------------------------------
336
337quiet_cmd_gzip = GZIP $@
338 cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@
339
340# DTC
341# ---------------------------------------------------------------------------
342DTC ?= $(objtree)/scripts/dtc/dtc
343DTC_FLAGS += -Wno-interrupt_provider \
344 -Wno-unique_unit_address
345
346# Disable noisy checks by default
347ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
348DTC_FLAGS += -Wno-unit_address_vs_reg \
349 -Wno-avoid_unnecessary_addr_size \
350 -Wno-alias_paths \
351 -Wno-graph_child_address \
352 -Wno-simple_bus_reg
353else
354DTC_FLAGS += \
355 -Wunique_unit_address_if_enabled
356endif
357
358ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)
359DTC_FLAGS += -Wnode_name_chars_strict \
360 -Wproperty_name_chars_strict \
361 -Winterrupt_provider \
362 -Wunique_unit_address
363endif
364
365DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
366
367# Set -@ if the target is a base DTB that overlay is applied onto
368DTC_FLAGS += $(if $(filter $(patsubst $(obj)/%,%,$@), $(base-dtb-y)), -@)
369
370# Generate an assembly file to wrap the output of the device tree compiler
371quiet_cmd_wrap_S_dtb = WRAP $@
372 cmd_wrap_S_dtb = { \
373 symbase=__$(patsubst .%,%,$(suffix $<))_$(subst -,_,$(notdir $*)); \
374 echo '\#include <asm-generic/vmlinux.lds.h>'; \
375 echo '.section .dtb.init.rodata,"a"'; \
376 echo '.balign STRUCT_ALIGNMENT'; \
377 echo ".global $${symbase}_begin"; \
378 echo "$${symbase}_begin:"; \
379 echo '.incbin "$<" '; \
380 echo ".global $${symbase}_end"; \
381 echo "$${symbase}_end:"; \
382 echo '.balign STRUCT_ALIGNMENT'; \
383 } > $@
384
385$(obj)/%.dtb.S: $(obj)/%.dtb FORCE
386 $(call if_changed,wrap_S_dtb)
387
388$(obj)/%.dtbo.S: $(obj)/%.dtbo FORCE
389 $(call if_changed,wrap_S_dtb)
390
391quiet_cmd_dtc = DTC $@
392cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
393 $(DTC) -o $@ -b 0 \
394 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
395 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
396 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
397
398quiet_cmd_fdtoverlay = DTOVL $@
399 cmd_fdtoverlay = $(objtree)/scripts/dtc/fdtoverlay -o $@ -i $(real-prereqs)
400
401$(multi-dtb-y): FORCE
402 $(call if_changed,fdtoverlay)
403$(call multi_depend, $(multi-dtb-y), .dtb, -dtbs)
404
405ifneq ($(CHECK_DTBS)$(CHECK_DT_BINDING),)
406DT_CHECKER ?= dt-validate
407DT_CHECKER_FLAGS ?= $(if $(DT_SCHEMA_FILES),-l $(DT_SCHEMA_FILES),-m)
408DT_BINDING_DIR := Documentation/devicetree/bindings
409DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.json
410
411quiet_cmd_dtb = DTC_CHK $@
412 cmd_dtb = $(cmd_dtc) ; $(DT_CHECKER) $(DT_CHECKER_FLAGS) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ || true
413else
414quiet_cmd_dtb = $(quiet_cmd_dtc)
415 cmd_dtb = $(cmd_dtc)
416endif
417
418$(obj)/%.dtb: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
419 $(call if_changed_dep,dtb)
420
421$(obj)/%.dtbo: $(src)/%.dtso $(DTC) FORCE
422 $(call if_changed_dep,dtc)
423
424dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
425
426# Bzip2
427# ---------------------------------------------------------------------------
428
429# Bzip2 and LZMA do not include size in file... so we have to fake that;
430# append the size as a 32-bit littleendian number as gzip does.
431size_append = printf $(shell \
432dec_size=0; \
433for F in $(real-prereqs); do \
434 fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \
435 dec_size=$$(expr $$dec_size + $$fsize); \
436done; \
437printf "%08x\n" $$dec_size | \
438 sed 's/\(..\)/\1 /g' | { \
439 read ch0 ch1 ch2 ch3; \
440 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
441 printf '%s%03o' '\\' $$((0x$$ch)); \
442 done; \
443 } \
444)
445
446quiet_cmd_file_size = GEN $@
447 cmd_file_size = $(size_append) > $@
448
449quiet_cmd_bzip2 = BZIP2 $@
450 cmd_bzip2 = cat $(real-prereqs) | $(KBZIP2) -9 > $@
451
452quiet_cmd_bzip2_with_size = BZIP2 $@
453 cmd_bzip2_with_size = { cat $(real-prereqs) | $(KBZIP2) -9; $(size_append); } > $@
454
455# Lzma
456# ---------------------------------------------------------------------------
457
458quiet_cmd_lzma = LZMA $@
459 cmd_lzma = cat $(real-prereqs) | $(LZMA) -9 > $@
460
461quiet_cmd_lzma_with_size = LZMA $@
462 cmd_lzma_with_size = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@
463
464quiet_cmd_lzo = LZO $@
465 cmd_lzo = cat $(real-prereqs) | $(KLZOP) -9 > $@
466
467quiet_cmd_lzo_with_size = LZO $@
468 cmd_lzo_with_size = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@
469
470quiet_cmd_lz4 = LZ4 $@
471 cmd_lz4 = cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout > $@
472
473quiet_cmd_lz4_with_size = LZ4 $@
474 cmd_lz4_with_size = { cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout; \
475 $(size_append); } > $@
476
477# U-Boot mkimage
478# ---------------------------------------------------------------------------
479
480MKIMAGE := $(srctree)/scripts/mkuboot.sh
481
482# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
483# the number of overrides in arch makefiles
484UIMAGE_ARCH ?= $(SRCARCH)
485UIMAGE_COMPRESSION ?= $(or $(2),none)
486UIMAGE_OPTS-y ?=
487UIMAGE_TYPE ?= kernel
488UIMAGE_LOADADDR ?= arch_must_set_this
489UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
490UIMAGE_NAME ?= Linux-$(KERNELRELEASE)
491
492quiet_cmd_uimage = UIMAGE $@
493 cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
494 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
495 -T $(UIMAGE_TYPE) \
496 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
497 -n '$(UIMAGE_NAME)' -d $< $@
498
499# XZ
500# ---------------------------------------------------------------------------
501# Use xzkern to compress the kernel image and xzmisc to compress other things.
502#
503# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
504# of the kernel decompressor. A BCJ filter is used if it is available for
505# the target architecture. xzkern also appends uncompressed size of the data
506# using size_append. The .xz format has the size information available at
507# the end of the file too, but it's in more complex format and it's good to
508# avoid changing the part of the boot code that reads the uncompressed size.
509# Note that the bytes added by size_append will make the xz tool think that
510# the file is corrupt. This is expected.
511#
512# xzmisc doesn't use size_append, so it can be used to create normal .xz
513# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
514# big dictionary would increase the memory usage too much in the multi-call
515# decompression mode. A BCJ filter isn't used either.
516quiet_cmd_xzkern = XZKERN $@
517 cmd_xzkern = cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh > $@
518
519quiet_cmd_xzkern_with_size = XZKERN $@
520 cmd_xzkern_with_size = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \
521 $(size_append); } > $@
522
523quiet_cmd_xzmisc = XZMISC $@
524 cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@
525
526# ZSTD
527# ---------------------------------------------------------------------------
528# Appends the uncompressed size of the data using size_append. The .zst
529# format has the size information available at the beginning of the file too,
530# but it's in a more complex format and it's good to avoid changing the part
531# of the boot code that reads the uncompressed size.
532#
533# Note that the bytes added by size_append will make the zstd tool think that
534# the file is corrupt. This is expected.
535#
536# zstd uses a maximum window size of 8 MB. zstd22 uses a maximum window size of
537# 128 MB. zstd22 is used for kernel compression because it is decompressed in a
538# single pass, so zstd doesn't need to allocate a window buffer. When streaming
539# decompression is used, like initramfs decompression, zstd22 should likely not
540# be used because it would require zstd to allocate a 128 MB buffer.
541
542quiet_cmd_zstd = ZSTD $@
543 cmd_zstd = cat $(real-prereqs) | $(ZSTD) -19 > $@
544
545quiet_cmd_zstd22 = ZSTD22 $@
546 cmd_zstd22 = cat $(real-prereqs) | $(ZSTD) -22 --ultra > $@
547
548quiet_cmd_zstd22_with_size = ZSTD22 $@
549 cmd_zstd22_with_size = { cat $(real-prereqs) | $(ZSTD) -22 --ultra; $(size_append); } > $@
550
551# ASM offsets
552# ---------------------------------------------------------------------------
553
554# Default sed regexp - multiline due to syntax constraints
555#
556# Use [:space:] because LLVM's integrated assembler inserts <tab> around
557# the .ascii directive whereas GCC keeps the <space> as-is.
558define sed-offsets
559 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
560 /^->/{s:->#\(.*\):/* \1 */:; \
561 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
562 s:->::; p;}'
563endef
564
565# Use filechk to avoid rebuilds when a header changes, but the resulting file
566# does not
567define filechk_offsets
568 echo "#ifndef $2"; \
569 echo "#define $2"; \
570 echo "/*"; \
571 echo " * DO NOT MODIFY."; \
572 echo " *"; \
573 echo " * This file was generated by Kbuild"; \
574 echo " */"; \
575 echo ""; \
576 sed -ne $(sed-offsets) < $<; \
577 echo ""; \
578 echo "#endif"
579endef