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 \
172 -I$(srctree)/include \
173 -I$(srctree)/arch/$(ARCH)/include \
174 -include $(srctree)/include/linux/kconfig.h \
178 # Finds the multi-part object the current object will be linked into
179 modname-multi = $(sort $(foreach m,$(multi-used),\
180 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
182 # Useful for describing the dependency of composite objects
184 # $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
186 $(foreach m, $(notdir $1), \
188 $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
191 ifdef REGENERATE_PARSERS
194 # ---------------------------------------------------------------------------
195 quiet_cmd_gperf = GPERF $@
196 cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $<
198 .PRECIOUS: $(src)/%.hash.c_shipped
199 $(src)/%.hash.c_shipped: $(src)/%.gperf
203 # ---------------------------------------------------------------------------
204 LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
206 quiet_cmd_flex = LEX $@
207 cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
209 .PRECIOUS: $(src)/%.lex.c_shipped
210 $(src)/%.lex.c_shipped: $(src)/%.l
214 # ---------------------------------------------------------------------------
215 YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
217 quiet_cmd_bison = YACC $@
218 cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
220 .PRECIOUS: $(src)/%.tab.c_shipped
221 $(src)/%.tab.c_shipped: $(src)/%.y
224 quiet_cmd_bison_h = YACC $@
225 cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
227 .PRECIOUS: $(src)/%.tab.h_shipped
228 $(src)/%.tab.h_shipped: $(src)/%.y
234 # ===========================================================================
236 quiet_cmd_shipped = SHIPPED $@
237 cmd_shipped = cat $< > $@
239 $(obj)/%: $(src)/%_shipped
242 # Commands useful for building a boot image
243 # ===========================================================================
247 # target: source(s) FORCE
248 # $(if_changed,ld/objcopy/gzip)
250 # and add target to extra-y so that we know we have to
251 # read in the saved command line
254 # ---------------------------------------------------------------------------
257 cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
258 $(filter-out FORCE,$^) -o $@
261 # ---------------------------------------------------------------------------
263 quiet_cmd_objcopy = OBJCOPY $@
264 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
267 # ---------------------------------------------------------------------------
269 quiet_cmd_gzip = GZIP $@
270 cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
274 # ---------------------------------------------------------------------------
276 # Generate an assembly file to wrap the output of the device tree compiler
277 quiet_cmd_dt_S_dtb= DTB $@
278 # Modified for U-Boot
281 echo '.section .dtb.init.rodata,"a"'; \
283 echo '.global __dtb_$(subst -,_,$(*F))_begin'; \
284 echo '__dtb_$(subst -,_,$(*F))_begin:'; \
285 echo '.incbin "$<" '; \
286 echo '__dtb_$(subst -,_,$(*F))_end:'; \
287 echo '.global __dtb_$(subst -,_,$(*F))_end'; \
291 $(obj)/%.dtb.S: $(obj)/%.dtb
294 quiet_cmd_dtc = DTC $@
295 # Modified for U-Boot
296 cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
297 $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
298 $(DTC) -O dtb -o $@ -b 0 \
299 -i $(dir $<) $(DTC_FLAGS) \
300 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
301 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
303 $(obj)/%.dtb: $(src)/%.dts FORCE
304 $(call if_changed_dep,dtc)
306 dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
309 # ---------------------------------------------------------------------------
311 # Generate an assembly file to wrap the font data
312 quiet_cmd_S_ttf= TTF $@
313 # Modified for U-Boot
316 echo '.section .rodata.ttf.init,"a"'; \
318 echo '.global __ttf_$(*F)_begin'; \
319 echo '__ttf_$(*F)_begin:'; \
320 echo '.incbin "$<" '; \
321 echo '__ttf_$(*F)_end:'; \
322 echo '.global __ttf_$(*F)_end'; \
326 $(obj)/%.S: $(src)/%.ttf
329 # EFI Hello World application
330 # ---------------------------------------------------------------------------
332 # Generate an assembly file to wrap the EFI app
335 echo '.section .rodata.efi.init,"a"'; \
337 echo '.global __efi_hello_world_begin'; \
338 echo '__efi_hello_world_begin:'; \
339 echo '.incbin "$<" '; \
340 echo '__efi_hello_world_end:'; \
341 echo '.global __efi_hello_world_end'; \
345 $(obj)/%_efi.S: $(obj)/%.efi
348 $(obj)/%.efi: $(obj)/%.so
349 $(OBJCOPY) -j .header -j .text -j .sdata -j .data -j .dynamic \
350 -j .dynsym -j .rel* -j .rela* -j .reloc \
351 $(if $(EFI_TARGET),$(EFI_TARGET),-O binary) $^ $@
353 EFI_LDS_PATH = $(srctree)/arch/$(ARCH)/lib/$(EFI_LDS)
355 $(obj)/helloworld.so: $(EFI_LDS_PATH)
357 $(obj)/helloworld.so: $(obj)/helloworld.o arch/$(ARCH)/lib/$(EFI_CRT0) \
358 arch/$(ARCH)/lib/$(EFI_RELOC)
359 $(LD) -nostdlib -znocombreloc -T $(EFI_LDS_PATH) -shared -Bsymbolic \
363 # ---------------------------------------------------------------------------
364 quiet_cmd_acpi_c_asl= ASL $<
366 $(CPP) -x assembler-with-cpp -D__ASSEMBLY__ -P $(UBOOTINCLUDE) -o $<.tmp $<; \
367 iasl -p $< -tc $<.tmp $(if $(KBUILD_VERBOSE:1=), >/dev/null); \
368 mv $(patsubst %.asl,%.hex,$<) $@
370 $(obj)/dsdt.c: $(src)/dsdt.asl
371 $(call cmd,acpi_c_asl)
374 # ---------------------------------------------------------------------------
376 # Bzip2 and LZMA do not include size in file... so we have to fake that;
377 # append the size as a 32-bit littleendian number as gzip does.
378 size_append = printf $(shell \
381 fsize=$$(stat -c "%s" $$F); \
382 dec_size=$$(expr $$dec_size + $$fsize); \
384 printf "%08x\n" $$dec_size | \
385 sed 's/\(..\)/\1 /g' | { \
386 read ch0 ch1 ch2 ch3; \
387 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
388 printf '%s%03o' '\\' $$((0x$$ch)); \
393 quiet_cmd_bzip2 = BZIP2 $@
394 cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
395 bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
399 # ---------------------------------------------------------------------------
401 quiet_cmd_lzma = LZMA $@
402 cmd_lzma = (cat $(filter-out FORCE,$^) | \
403 lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
406 quiet_cmd_lzo = LZO $@
407 cmd_lzo = (cat $(filter-out FORCE,$^) | \
408 lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
411 quiet_cmd_lz4 = LZ4 $@
412 cmd_lz4 = (cat $(filter-out FORCE,$^) | \
413 lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
417 # ---------------------------------------------------------------------------
419 MKIMAGE := $(srctree)/scripts/mkuboot.sh
421 # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
422 # the number of overrides in arch makefiles
423 UIMAGE_ARCH ?= $(SRCARCH)
424 UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
426 UIMAGE_TYPE ?= kernel
427 UIMAGE_LOADADDR ?= arch_must_set_this
428 UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
429 UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
433 quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT)
434 cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
435 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
437 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
438 -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
441 # ---------------------------------------------------------------------------
442 # Use xzkern to compress the kernel image and xzmisc to compress other things.
444 # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
445 # of the kernel decompressor. A BCJ filter is used if it is available for
446 # the target architecture. xzkern also appends uncompressed size of the data
447 # using size_append. The .xz format has the size information available at
448 # the end of the file too, but it's in more complex format and it's good to
449 # avoid changing the part of the boot code that reads the uncompressed size.
450 # Note that the bytes added by size_append will make the xz tool think that
451 # the file is corrupt. This is expected.
453 # xzmisc doesn't use size_append, so it can be used to create normal .xz
454 # files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
455 # big dictionary would increase the memory usage too much in the multi-call
456 # decompression mode. A BCJ filter isn't used either.
457 quiet_cmd_xzkern = XZKERN $@
458 cmd_xzkern = (cat $(filter-out FORCE,$^) | \
459 sh $(srctree)/scripts/xz_wrap.sh && \
460 $(call size_append, $(filter-out FORCE,$^))) > $@ || \
463 quiet_cmd_xzmisc = XZMISC $@
464 cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
465 xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
468 # Additional commands for U-Boot
471 # ---------------------------------------------------------------------------
472 quiet_cmd_mkimage = MKIMAGE $@
473 cmd_mkimage = $(objtree)/tools/mkimage $(MKIMAGEFLAGS_$(@F)) -d $< $@ \
474 $(if $(KBUILD_VERBOSE:1=), >/dev/null)