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 # Try these files in order to find the U-Boot-specific .dtsi include file
168 u_boot_dtsi_options = $(strip $(wildcard $(dir $<)$(basename $(notdir $<))-u-boot.dtsi) \
169 $(wildcard $(dir $<)$(subst $\",,$(CONFIG_SYS_SOC))-u-boot.dtsi) \
170 $(wildcard $(dir $<)$(subst $\",,$(CONFIG_SYS_CPU))-u-boot.dtsi) \
171 $(wildcard $(dir $<)$(subst $\",,$(CONFIG_SYS_VENDOR))-u-boot.dtsi) \
172 $(wildcard $(dir $<)u-boot.dtsi))
174 u_boot_dtsi_options_raw = $(warning Automatic .dtsi inclusion: options: \
175 $(dir $<)$(basename $(notdir $<))-u-boot.dtsi \
176 $(dir $<)$(subst $\",,$(CONFIG_SYS_SOC))-u-boot.dtsi \
177 $(dir $<)$(subst $\",,$(CONFIG_SYS_CPU))-u-boot.dtsi \
178 $(dir $<)$(subst $\",,$(CONFIG_SYS_VENDOR))-u-boot.dtsi \
179 $(dir $<)u-boot.dtsi ... \
180 found: $(if $(u_boot_dtsi_options),"$(u_boot_dtsi_options)",nothing!))
182 # Uncomment for debugging
183 # This shows all the files that were considered and the one that we chose.
184 # u_boot_dtsi_options_debug = $(u_boot_dtsi_options_raw)
186 # We use the first match
187 u_boot_dtsi = $(strip $(u_boot_dtsi_options_debug) \
188 $(notdir $(firstword $(u_boot_dtsi_options))))
190 # Modified for U-Boot
191 dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \
192 -I$(srctree)/arch/$(ARCH)/dts \
193 -I$(srctree)/arch/$(ARCH)/dts/include \
195 -I$(srctree)/include \
196 -I$(srctree)/arch/$(ARCH)/include \
197 -include $(srctree)/include/linux/kconfig.h \
201 # Finds the multi-part object the current object will be linked into
202 modname-multi = $(sort $(foreach m,$(multi-used),\
203 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
205 # Useful for describing the dependency of composite objects
207 # $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
209 $(foreach m, $(notdir $1), \
211 $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
214 ifdef REGENERATE_PARSERS
217 # ---------------------------------------------------------------------------
218 quiet_cmd_gperf = GPERF $@
219 cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $<
221 .PRECIOUS: $(src)/%.hash.c_shipped
222 $(src)/%.hash.c_shipped: $(src)/%.gperf
226 # ---------------------------------------------------------------------------
227 LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
229 quiet_cmd_flex = LEX $@
230 cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
232 .PRECIOUS: $(src)/%.lex.c_shipped
233 $(src)/%.lex.c_shipped: $(src)/%.l
237 # ---------------------------------------------------------------------------
238 YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
240 quiet_cmd_bison = YACC $@
241 cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
243 .PRECIOUS: $(src)/%.tab.c_shipped
244 $(src)/%.tab.c_shipped: $(src)/%.y
247 quiet_cmd_bison_h = YACC $@
248 cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
250 .PRECIOUS: $(src)/%.tab.h_shipped
251 $(src)/%.tab.h_shipped: $(src)/%.y
257 # ===========================================================================
259 quiet_cmd_shipped = SHIPPED $@
260 cmd_shipped = cat $< > $@
262 $(obj)/%: $(src)/%_shipped
265 # Commands useful for building a boot image
266 # ===========================================================================
270 # target: source(s) FORCE
271 # $(if_changed,ld/objcopy/gzip)
273 # and add target to extra-y so that we know we have to
274 # read in the saved command line
277 # ---------------------------------------------------------------------------
280 cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
281 $(filter-out FORCE,$^) -o $@
284 # ---------------------------------------------------------------------------
286 quiet_cmd_objcopy = OBJCOPY $@
287 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
290 # ---------------------------------------------------------------------------
292 quiet_cmd_gzip = GZIP $@
293 cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
297 # ---------------------------------------------------------------------------
299 # Generate an assembly file to wrap the output of the device tree compiler
300 quiet_cmd_dt_S_dtb= DTB $@
301 # Modified for U-Boot
304 echo '.section .dtb.init.rodata,"a"'; \
306 echo '.global __dtb_$(subst -,_,$(*F))_begin'; \
307 echo '__dtb_$(subst -,_,$(*F))_begin:'; \
308 echo '.incbin "$<" '; \
309 echo '__dtb_$(subst -,_,$(*F))_end:'; \
310 echo '.global __dtb_$(subst -,_,$(*F))_end'; \
314 $(obj)/%.dtb.S: $(obj)/%.dtb
317 quiet_cmd_dtc = DTC $@
318 # Modified for U-Boot
319 # Bring in any U-Boot-specific include at the end of the file
320 cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
321 (cat $<; $(if $(u_boot_dtsi),echo '\#include "$(u_boot_dtsi)"')) > $(pre-tmp); \
322 $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $(pre-tmp) ; \
323 $(DTC) -O dtb -o $@ -b 0 \
324 -i $(dir $<) $(DTC_FLAGS) \
325 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
326 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
328 $(obj)/%.dtb: $(src)/%.dts FORCE
329 $(call if_changed_dep,dtc)
331 pre-tmp = $(subst $(comma),_,$(dot-target).pre.tmp)
332 dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
335 # ---------------------------------------------------------------------------
337 quiet_cmd_dtco = DTCO $@
338 # Rule for objects only; does not put specific u-boot include at the end
339 # No generation of assembly file either
340 # Modified for U-Boot
341 cmd_dtco = mkdir -p $(dir ${dtc-tmp}) ; \
342 $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) - ; \
343 $(DTC) -@ -O dtb -o $@ -b 0 \
344 -i $(dir $<) $(DTC_FLAGS) \
345 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
346 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
348 $(obj)/%.dtbo: $(src)/%.dts FORCE
349 $(call if_changed_dep,dtco)
352 # ---------------------------------------------------------------------------
354 # Generate an assembly file to wrap the font data
355 quiet_cmd_S_ttf= TTF $@
356 # Modified for U-Boot
359 echo '.section .rodata.ttf.init,"a"'; \
361 echo '.global __ttf_$(*F)_begin'; \
362 echo '__ttf_$(*F)_begin:'; \
363 echo '.incbin "$<" '; \
364 echo '__ttf_$(*F)_end:'; \
365 echo '.global __ttf_$(*F)_end'; \
369 $(obj)/%.S: $(src)/%.ttf
373 # A Makefile target *.efi is built as EFI application.
374 # A Makefile target *_efi.S wraps *.efi as built-in EFI application.
375 # ---------------------------------------------------------------------------
377 # Generate an assembly file to wrap the EFI app
380 echo '.section .rodata.$*.init,"a"'; \
382 echo '.global __efi_$*_begin'; \
383 echo '__efi_$*_begin:'; \
384 echo '.incbin "$<" '; \
385 echo '__efi_$*_end:'; \
386 echo '.global __efi_$*_end'; \
390 $(obj)/%_efi.S: $(obj)/%.efi
393 quiet_cmd_efi_objcopy = OBJCOPY $@
394 cmd_efi_objcopy = $(OBJCOPY) -j .header -j .text -j .sdata -j .data -j \
395 .dynamic -j .dynsym -j .rel* -j .rela* -j .reloc \
396 $(if $(EFI_TARGET),$(EFI_TARGET),-O binary) $^ $@
398 $(obj)/%.efi: $(obj)/%_efi.so
399 $(call cmd,efi_objcopy)
401 quiet_cmd_efi_ld = LD $@
402 cmd_efi_ld = $(LD) -nostdlib -znocombreloc -T $(EFI_LDS_PATH) -shared \
405 EFI_LDS_PATH = $(srctree)/arch/$(ARCH)/lib/$(EFI_LDS)
407 $(obj)/%_efi.so: $(obj)/%.o arch/$(ARCH)/lib/$(EFI_CRT0) \
408 arch/$(ARCH)/lib/$(EFI_RELOC)
412 # ---------------------------------------------------------------------------
413 quiet_cmd_acpi_c_asl= ASL $<
415 $(CPP) -x assembler-with-cpp -D__ASSEMBLY__ -P $(UBOOTINCLUDE) -o $<.tmp $<; \
416 iasl -p $< -tc $<.tmp $(if $(KBUILD_VERBOSE:1=), >/dev/null) && \
417 mv $(patsubst %.asl,%.hex,$<) $@
419 $(obj)/dsdt.c: $(src)/dsdt.asl
420 $(call cmd,acpi_c_asl)
423 # ---------------------------------------------------------------------------
425 # Bzip2 and LZMA do not include size in file... so we have to fake that;
426 # append the size as a 32-bit littleendian number as gzip does.
427 size_append = printf $(shell \
430 fsize=$$(stat -c "%s" $$F); \
431 dec_size=$$(expr $$dec_size + $$fsize); \
433 printf "%08x\n" $$dec_size | \
434 sed 's/\(..\)/\1 /g' | { \
435 read ch0 ch1 ch2 ch3; \
436 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
437 printf '%s%03o' '\\' $$((0x$$ch)); \
442 quiet_cmd_bzip2 = BZIP2 $@
443 cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
444 bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
448 # ---------------------------------------------------------------------------
450 quiet_cmd_lzma = LZMA $@
451 cmd_lzma = (cat $(filter-out FORCE,$^) | \
452 lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
455 quiet_cmd_lzo = LZO $@
456 cmd_lzo = (cat $(filter-out FORCE,$^) | \
457 lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
460 quiet_cmd_lz4 = LZ4 $@
461 cmd_lz4 = (cat $(filter-out FORCE,$^) | \
462 lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
466 # ---------------------------------------------------------------------------
468 MKIMAGE := $(srctree)/scripts/mkuboot.sh
470 # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
471 # the number of overrides in arch makefiles
472 UIMAGE_ARCH ?= $(SRCARCH)
473 UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
475 UIMAGE_TYPE ?= kernel
476 UIMAGE_LOADADDR ?= arch_must_set_this
477 UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
478 UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
482 quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT)
483 cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
484 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
486 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
487 -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
490 # ---------------------------------------------------------------------------
491 # Use xzkern to compress the kernel image and xzmisc to compress other things.
493 # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
494 # of the kernel decompressor. A BCJ filter is used if it is available for
495 # the target architecture. xzkern also appends uncompressed size of the data
496 # using size_append. The .xz format has the size information available at
497 # the end of the file too, but it's in more complex format and it's good to
498 # avoid changing the part of the boot code that reads the uncompressed size.
499 # Note that the bytes added by size_append will make the xz tool think that
500 # the file is corrupt. This is expected.
502 # xzmisc doesn't use size_append, so it can be used to create normal .xz
503 # files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
504 # big dictionary would increase the memory usage too much in the multi-call
505 # decompression mode. A BCJ filter isn't used either.
506 quiet_cmd_xzkern = XZKERN $@
507 cmd_xzkern = (cat $(filter-out FORCE,$^) | \
508 sh $(srctree)/scripts/xz_wrap.sh && \
509 $(call size_append, $(filter-out FORCE,$^))) > $@ || \
512 quiet_cmd_xzmisc = XZMISC $@
513 cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
514 xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
517 # Additional commands for U-Boot
520 # ---------------------------------------------------------------------------
521 MKIMAGEOUTPUT ?= /dev/null
522 quiet_cmd_mkimage = MKIMAGE $@
523 cmd_mkimage = $(objtree)/tools/mkimage $(MKIMAGEFLAGS_$(@F)) -d $< $@ \
524 $(if $(KBUILD_VERBOSE:1=), >$(MKIMAGEOUTPUT))