2 # SPDX-License-Identifier: GPL-2.0
4 # Backward compatibility
5 asflags-y += $(EXTRA_AFLAGS)
6 ccflags-y += $(EXTRA_CFLAGS)
7 cppflags-y += $(EXTRA_CPPFLAGS)
8 ldflags-y += $(EXTRA_LDFLAGS)
11 # flags that take effect in sub directories
12 export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y)
13 export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(subdir-ccflags-y)
15 # Figure out what we need to build from the various variables
16 # ===========================================================================
18 # When an object is listed to be built compiled-in and modular,
19 # only build the compiled-in version
21 obj-m := $(filter-out $(obj-y),$(obj-m))
23 # Libraries are always collected in one lib file.
24 # Filter out objects already built-in
26 lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
29 # Handle objects in subdirs
30 # ---------------------------------------------------------------------------
31 # o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
32 # and add the directory to the list of dirs to descend into: $(subdir-y)
33 # o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
34 # and add the directory to the list of dirs to descend into: $(subdir-m)
37 # Unfortunately, we don't have information about ordering between -y
38 # and -m subdirs. Just put -y's first.
39 modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
41 __subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
42 subdir-y += $(__subdir-y)
43 __subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
44 subdir-m += $(__subdir-m)
45 obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
46 obj-m := $(filter-out %/, $(obj-m))
48 # Subdirectories we need to descend into
50 subdir-ym := $(sort $(subdir-y) $(subdir-m))
52 # if $(foo-objs) exists, foo.o is a composite object
53 multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
54 multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
55 multi-used := $(multi-used-y) $(multi-used-m)
56 single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
58 # Build list of the parts of our composite objects, our composite
59 # objects depend on those (obviously)
60 multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
61 multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
62 multi-objs := $(multi-objs-y) $(multi-objs-m)
64 # $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
65 # tell kbuild to descend
66 subdir-obj-y := $(filter %/built-in.o, $(obj-y))
68 # $(obj-dirs) is a list of directories that contain object files
69 obj-dirs := $(dir $(multi-objs) $(obj-y))
71 # Replace multi-part objects by their individual parts, look at local dir only
72 real-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)
73 real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
77 extra-y := $(addprefix $(obj)/,$(extra-y))
78 always := $(addprefix $(obj)/,$(always))
79 targets := $(addprefix $(obj)/,$(targets))
80 modorder := $(addprefix $(obj)/,$(modorder))
81 obj-y := $(addprefix $(obj)/,$(obj-y))
82 obj-m := $(addprefix $(obj)/,$(obj-m))
83 lib-y := $(addprefix $(obj)/,$(lib-y))
84 subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
85 real-objs-y := $(addprefix $(obj)/,$(real-objs-y))
86 real-objs-m := $(addprefix $(obj)/,$(real-objs-m))
87 single-used-m := $(addprefix $(obj)/,$(single-used-m))
88 multi-used-y := $(addprefix $(obj)/,$(multi-used-y))
89 multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
90 multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))
91 multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m))
92 subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
93 obj-dirs := $(addprefix $(obj)/,$(obj-dirs))
95 # These flags are needed for modversions and compiling, so we define them here
97 # $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will
98 # end up in (or would, if it gets compiled in)
99 # Note: Files that end up in two or more modules are compiled without the
100 # KBUILD_MODNAME definition. The reason is that any made-up name would
101 # differ in different configs.
102 name-fix = $(subst $(comma),_,$(subst -,_,$1))
103 basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))"
104 modname_flags = $(if $(filter 1,$(words $(modname))),\
105 -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))")
107 orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \
108 $(ccflags-y) $(CFLAGS_$(basetarget).o)
109 _c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
110 orig_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
111 $(asflags-y) $(AFLAGS_$(basetarget).o)
112 _a_flags = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags))
113 _cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
116 # Enable gcov profiling flags for a file, directory or for all files depending
117 # on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
120 ifeq ($(CONFIG_GCOV_KERNEL),y)
121 _c_flags += $(if $(patsubst n%,, \
122 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
127 # Enable address sanitizer flags for kernel except some files or directories
128 # we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
130 ifeq ($(CONFIG_KASAN),y)
131 _c_flags += $(if $(patsubst n%,, \
132 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
136 # If building the kernel in a separate objtree expand all occurrences
137 # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
139 ifeq ($(KBUILD_SRC),)
140 __c_flags = $(_c_flags)
141 __a_flags = $(_a_flags)
142 __cpp_flags = $(_cpp_flags)
145 # -I$(obj) locates generated .h files
146 # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
147 # and locates generated .h files
148 # FIXME: Replace both with specific CFLAGS* statements in the makefiles
149 __c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags)
150 __a_flags = $(call flags,_a_flags)
151 __cpp_flags = $(call flags,_cpp_flags)
154 # Modified for U-Boot: LINUXINCLUDE -> UBOOTINCLUDE
155 c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(UBOOTINCLUDE) \
156 $(__c_flags) $(modkern_cflags) \
157 -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags)
159 a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(UBOOTINCLUDE) \
160 $(__a_flags) $(modkern_aflags)
162 cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(UBOOTINCLUDE) \
165 ld_flags = $(LDFLAGS) $(ldflags-y)
167 # Modified for U-Boot
168 dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \
169 -I$(srctree)/arch/$(ARCH)/dts \
170 -I$(srctree)/arch/$(ARCH)/dts/include \
173 # Finds the multi-part object the current object will be linked into
174 modname-multi = $(sort $(foreach m,$(multi-used),\
175 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
177 # Useful for describing the dependency of composite objects
179 # $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
181 $(foreach m, $(notdir $1), \
183 $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
186 ifdef REGENERATE_PARSERS
189 # ---------------------------------------------------------------------------
190 quiet_cmd_gperf = GPERF $@
191 cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $<
193 .PRECIOUS: $(src)/%.hash.c_shipped
194 $(src)/%.hash.c_shipped: $(src)/%.gperf
198 # ---------------------------------------------------------------------------
199 LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
201 quiet_cmd_flex = LEX $@
202 cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
204 .PRECIOUS: $(src)/%.lex.c_shipped
205 $(src)/%.lex.c_shipped: $(src)/%.l
209 # ---------------------------------------------------------------------------
210 YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
212 quiet_cmd_bison = YACC $@
213 cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
215 .PRECIOUS: $(src)/%.tab.c_shipped
216 $(src)/%.tab.c_shipped: $(src)/%.y
219 quiet_cmd_bison_h = YACC $@
220 cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
222 .PRECIOUS: $(src)/%.tab.h_shipped
223 $(src)/%.tab.h_shipped: $(src)/%.y
229 # ===========================================================================
231 quiet_cmd_shipped = SHIPPED $@
232 cmd_shipped = cat $< > $@
234 $(obj)/%: $(src)/%_shipped
237 # Commands useful for building a boot image
238 # ===========================================================================
242 # target: source(s) FORCE
243 # $(if_changed,ld/objcopy/gzip)
245 # and add target to extra-y so that we know we have to
246 # read in the saved command line
249 # ---------------------------------------------------------------------------
252 cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
253 $(filter-out FORCE,$^) -o $@
256 # ---------------------------------------------------------------------------
258 quiet_cmd_objcopy = OBJCOPY $@
259 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
262 # ---------------------------------------------------------------------------
264 quiet_cmd_gzip = GZIP $@
265 cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
269 # ---------------------------------------------------------------------------
271 # Generate an assembly file to wrap the output of the device tree compiler
272 quiet_cmd_dt_S_dtb= DTB $@
273 # Modified for U-Boot
276 echo '.section .dtb.init.rodata,"a"'; \
278 echo '.global __dtb_$(*F)_begin'; \
279 echo '__dtb_$(*F)_begin:'; \
280 echo '.incbin "$<" '; \
281 echo '__dtb_$(*F)_end:'; \
282 echo '.global __dtb_$(*F)_end'; \
286 $(obj)/%.dtb.S: $(obj)/%.dtb
289 quiet_cmd_dtc = DTC $@
290 # Modified for U-Boot
291 cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
292 $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
293 $(DTC) -O dtb -o $@ -b 0 \
294 -i $(dir $<) $(DTC_FLAGS) \
295 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
296 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
298 $(obj)/%.dtb: $(src)/%.dts FORCE
299 $(call if_changed_dep,dtc)
301 dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
304 # ---------------------------------------------------------------------------
306 # Generate an assembly file to wrap the font data
307 quiet_cmd_S_ttf= TTF $@
308 # Modified for U-Boot
311 echo '.section .rodata.ttf.init,"a"'; \
313 echo '.global __ttf_$(*F)_begin'; \
314 echo '__ttf_$(*F)_begin:'; \
315 echo '.incbin "$<" '; \
316 echo '__ttf_$(*F)_end:'; \
317 echo '.global __ttf_$(*F)_end'; \
321 $(obj)/%.S: $(src)/%.ttf
325 # ---------------------------------------------------------------------------
326 quiet_cmd_acpi_c_asl= ASL $<
328 $(CPP) -x assembler-with-cpp -P $(UBOOTINCLUDE) -o $<.tmp $<; \
329 iasl -p $< -tc $<.tmp $(if $(KBUILD_VERBOSE:1=), >/dev/null); \
330 mv $(patsubst %.asl,%.hex,$<) $@
332 $(obj)/dsdt.c: $(src)/dsdt.asl
333 $(call cmd,acpi_c_asl)
336 # ---------------------------------------------------------------------------
338 # Bzip2 and LZMA do not include size in file... so we have to fake that;
339 # append the size as a 32-bit littleendian number as gzip does.
340 size_append = printf $(shell \
343 fsize=$$(stat -c "%s" $$F); \
344 dec_size=$$(expr $$dec_size + $$fsize); \
346 printf "%08x\n" $$dec_size | \
347 sed 's/\(..\)/\1 /g' | { \
348 read ch0 ch1 ch2 ch3; \
349 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
350 printf '%s%03o' '\\' $$((0x$$ch)); \
355 quiet_cmd_bzip2 = BZIP2 $@
356 cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
357 bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
361 # ---------------------------------------------------------------------------
363 quiet_cmd_lzma = LZMA $@
364 cmd_lzma = (cat $(filter-out FORCE,$^) | \
365 lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
368 quiet_cmd_lzo = LZO $@
369 cmd_lzo = (cat $(filter-out FORCE,$^) | \
370 lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
373 quiet_cmd_lz4 = LZ4 $@
374 cmd_lz4 = (cat $(filter-out FORCE,$^) | \
375 lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
379 # ---------------------------------------------------------------------------
381 MKIMAGE := $(srctree)/scripts/mkuboot.sh
383 # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
384 # the number of overrides in arch makefiles
385 UIMAGE_ARCH ?= $(SRCARCH)
386 UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
388 UIMAGE_TYPE ?= kernel
389 UIMAGE_LOADADDR ?= arch_must_set_this
390 UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
391 UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
395 quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT)
396 cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
397 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
399 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
400 -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
403 # ---------------------------------------------------------------------------
404 # Use xzkern to compress the kernel image and xzmisc to compress other things.
406 # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
407 # of the kernel decompressor. A BCJ filter is used if it is available for
408 # the target architecture. xzkern also appends uncompressed size of the data
409 # using size_append. The .xz format has the size information available at
410 # the end of the file too, but it's in more complex format and it's good to
411 # avoid changing the part of the boot code that reads the uncompressed size.
412 # Note that the bytes added by size_append will make the xz tool think that
413 # the file is corrupt. This is expected.
415 # xzmisc doesn't use size_append, so it can be used to create normal .xz
416 # files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
417 # big dictionary would increase the memory usage too much in the multi-call
418 # decompression mode. A BCJ filter isn't used either.
419 quiet_cmd_xzkern = XZKERN $@
420 cmd_xzkern = (cat $(filter-out FORCE,$^) | \
421 sh $(srctree)/scripts/xz_wrap.sh && \
422 $(call size_append, $(filter-out FORCE,$^))) > $@ || \
425 quiet_cmd_xzmisc = XZMISC $@
426 cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
427 xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
430 # Additional commands for U-Boot
433 # ---------------------------------------------------------------------------
434 quiet_cmd_mkimage = MKIMAGE $@
435 cmd_mkimage = $(objtree)/tools/mkimage $(MKIMAGEFLAGS_$(@F)) -d $< $@ \
436 $(if $(KBUILD_VERBOSE:1=), >/dev/null)