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scripts/Makefile.lib
14.6 KB
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# SPDX-License-Identifier: GPL-2.0 |
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# Backward compatibility asflags-y += $(EXTRA_AFLAGS) ccflags-y += $(EXTRA_CFLAGS) cppflags-y += $(EXTRA_CPPFLAGS) ldflags-y += $(EXTRA_LDFLAGS) |
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# flags that take effect in current and sub directories |
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KBUILD_AFLAGS += $(subdir-asflags-y) KBUILD_CFLAGS += $(subdir-ccflags-y) |
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# Figure out what we need to build from the various variables # =========================================================================== # When an object is listed to be built compiled-in and modular, # only build the compiled-in version |
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obj-m := $(filter-out $(obj-y),$(obj-m)) # Libraries are always collected in one lib file. # Filter out objects already built-in |
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lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m))) |
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# Determine modorder. # Unfortunately, we don't have information about ordering between -y # and -m subdirs. Just put -y's first. modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko)) |
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# Handle objects in subdirs # --------------------------------------------------------------------------- |
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# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.a |
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# and add the directory to the list of dirs to descend into: $(subdir-y) |
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# o if we encounter foo/ in $(obj-m), remove it from $(obj-m) |
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# and add the directory to the list of dirs to descend into: $(subdir-m) |
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__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y))) subdir-y += $(__subdir-y) __subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m))) subdir-m += $(__subdir-m) |
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obj-y := $(patsubst %/, %/built-in.a, $(obj-y)) |
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obj-m := $(filter-out %/, $(obj-m)) # Subdirectories we need to descend into |
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subdir-ym := $(sort $(subdir-y) $(subdir-m)) |
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# if $(foo-objs), $(foo-y), or $(foo-m) exists, foo.o is a composite object |
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multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m)))) |
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multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))), $(m)))) |
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multi-used := $(multi-used-y) $(multi-used-m) single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m))) |
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# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to # tell kbuild to descend |
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subdir-obj-y := $(filter %/built-in.a, $(obj-y)) |
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# Replace multi-part objects by their individual parts, # including built-in.a from subdirectories real-obj-y := $(foreach m, $(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) |
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real-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))) |
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# DTB # If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built extra-y += $(dtb-y) extra-$(CONFIG_OF_ALL_DTBS) += $(dtb-) |
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# Add subdir path extra-y := $(addprefix $(obj)/,$(extra-y)) always := $(addprefix $(obj)/,$(always)) targets := $(addprefix $(obj)/,$(targets)) |
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modorder := $(addprefix $(obj)/,$(modorder)) |
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obj-m := $(addprefix $(obj)/,$(obj-m)) lib-y := $(addprefix $(obj)/,$(lib-y)) subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y)) |
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real-obj-y := $(addprefix $(obj)/,$(real-obj-y)) real-obj-m := $(addprefix $(obj)/,$(real-obj-m)) |
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single-used-m := $(addprefix $(obj)/,$(single-used-m)) |
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multi-used-m := $(addprefix $(obj)/,$(multi-used-m)) |
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subdir-ym := $(addprefix $(obj)/,$(subdir-ym)) |
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# Finds the multi-part object the current object will be linked into. # If the object belongs to two or more multi-part objects, all of them are # concatenated with a colon separator. modname-multi = $(subst $(space),:,$(sort $(foreach m,$(multi-used),\ $(if $(filter $*.o, $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$(m:.o=))))) modname = $(if $(modname-multi),$(modname-multi),$(basetarget)) |
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# These flags are needed for modversions and compiling, so we define them here |
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# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will |
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# end up in (or would, if it gets compiled in) |
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name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote) basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget)) |
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modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname)) |
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orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) \ |
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$(ccflags-y) $(CFLAGS_$(basetarget).o) |
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_c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags)) |
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orig_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) \ |
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$(asflags-y) $(AFLAGS_$(basetarget).o) |
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_a_flags = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags)) |
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_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F)) |
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# # Enable gcov profiling flags for a file, directory or for all files depending # on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL # (in this order) # ifeq ($(CONFIG_GCOV_KERNEL),y) _c_flags += $(if $(patsubst n%,, \ $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \ $(CFLAGS_GCOV)) endif |
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# # Enable address sanitizer flags for kernel except some files or directories # we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE) # ifeq ($(CONFIG_KASAN),y) _c_flags += $(if $(patsubst n%,, \ $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \ |
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$(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE)) |
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endif |
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ifeq ($(CONFIG_UBSAN),y) _c_flags += $(if $(patsubst n%,, \ $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \ $(CFLAGS_UBSAN)) endif |
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ifeq ($(CONFIG_KCOV),y) _c_flags += $(if $(patsubst n%,, \ |
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$(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \ |
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$(CFLAGS_KCOV)) endif |
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# If building the kernel in a separate objtree expand all occurrences # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/'). ifeq ($(KBUILD_SRC),) __c_flags = $(_c_flags) __a_flags = $(_a_flags) __cpp_flags = $(_cpp_flags) else |
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# -I$(obj) locates generated .h files # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files # and locates generated .h files # FIXME: Replace both with specific CFLAGS* statements in the makefiles |
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__c_flags = $(if $(obj),$(call addtree,-I$(src)) -I$(obj)) \ |
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$(call flags,_c_flags) __a_flags = $(call flags,_a_flags) __cpp_flags = $(call flags,_cpp_flags) |
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endif |
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c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ |
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-include $(srctree)/include/linux/compiler_types.h \ |
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$(__c_flags) $(modkern_cflags) \ |
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$(basename_flags) $(modname_flags) |
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a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ |
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$(__a_flags) $(modkern_aflags) |
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cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ $(__cpp_flags) |
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ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) |
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DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes |
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dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \ |
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$(addprefix -I,$(DTC_INCLUDE)) \ |
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-undef -D__DTS__ |
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# Useful for describing the dependency of composite objects # Usage: # $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add) define multi_depend $(foreach m, $(notdir $1), \ $(eval $(obj)/$m: \ $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s))))))) endef |
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# LEX # --------------------------------------------------------------------------- |
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quiet_cmd_flex = LEX $@ |
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cmd_flex = $(LEX) -o$@ -L $< |
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|
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$(obj)/%.lex.c: $(src)/%.l FORCE |
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$(call if_changed,flex) |
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# YACC # --------------------------------------------------------------------------- |
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quiet_cmd_bison = YACC $@ |
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cmd_bison = $(YACC) -o$@ -t -l $< |
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$(obj)/%.tab.c: $(src)/%.y FORCE |
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$(call if_changed,bison) |
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quiet_cmd_bison_h = YACC $@ |
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cmd_bison_h = $(YACC) -o/dev/null --defines=$@ -t -l $< |
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$(obj)/%.tab.h: $(src)/%.y FORCE |
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$(call if_changed,bison_h) |
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# Shipped files # =========================================================================== quiet_cmd_shipped = SHIPPED $@ cmd_shipped = cat $< > $@ |
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$(obj)/%: $(src)/%_shipped |
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$(call cmd,shipped) # Commands useful for building a boot image # =========================================================================== |
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# |
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# Use as following: # # target: source(s) FORCE # $(if_changed,ld/objcopy/gzip) # |
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# and add target to extra-y so that we know we have to |
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# read in the saved command line # Linking # --------------------------------------------------------------------------- quiet_cmd_ld = LD $@ |
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cmd_ld = $(LD) $(ld_flags) $(filter-out FORCE,$^) -o $@ |
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# Objcopy # --------------------------------------------------------------------------- quiet_cmd_objcopy = OBJCOPY $@ cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ # Gzip # --------------------------------------------------------------------------- quiet_cmd_gzip = GZIP $@ |
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cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \ |
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(rm -f $@ ; false) |
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# DTC # --------------------------------------------------------------------------- |
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DTC ?= $(objtree)/scripts/dtc/dtc |
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|
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# Disable noisy checks by default |
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ifeq ($(findstring 1,$(KBUILD_ENABLE_EXTRA_GCC_CHECKS)),) |
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DTC_FLAGS += -Wno-unit_address_vs_reg \ |
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-Wno-unit_address_format \ |
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-Wno-avoid_unnecessary_addr_size \ -Wno-alias_paths \ |
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-Wno-graph_child_address \ -Wno-graph_port \ -Wno-unique_unit_address \ |
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-Wno-pci_device_reg |
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endif |
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ifneq ($(findstring 2,$(KBUILD_ENABLE_EXTRA_GCC_CHECKS)),) |
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DTC_FLAGS += -Wnode_name_chars_strict \ -Wproperty_name_chars_strict |
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endif |
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DTC_FLAGS += $(DTC_FLAGS_$(basetarget)) |
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# Generate an assembly file to wrap the output of the device tree compiler |
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quiet_cmd_dt_S_dtb= DTB $@ |
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cmd_dt_S_dtb= \ ( \ echo '\#include <asm-generic/vmlinux.lds.h>'; \ echo '.section .dtb.init.rodata,"a"'; \ echo '.balign STRUCT_ALIGNMENT'; \ |
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echo '.global __dtb_$(subst -,_,$(*F))_begin'; \ echo '__dtb_$(subst -,_,$(*F))_begin:'; \ |
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echo '.incbin "$<" '; \ |
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echo '__dtb_$(subst -,_,$(*F))_end:'; \ echo '.global __dtb_$(subst -,_,$(*F))_end'; \ |
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echo '.balign STRUCT_ALIGNMENT'; \ ) > $@ |
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$(obj)/%.dtb.S: $(obj)/%.dtb FORCE $(call if_changed,dt_S_dtb) |
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quiet_cmd_dtc = DTC $@ |
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cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \ $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \ |
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$(DTC) -O dtb -o $@ -b 0 \ |
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$(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \ |
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-d $(depfile).dtc.tmp $(dtc-tmp) ; \ cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) |
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$(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE |
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$(call if_changed_dep,dtc) |
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dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp) |
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# Bzip2 # --------------------------------------------------------------------------- |
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# Bzip2 and LZMA do not include size in file... so we have to fake that; # append the size as a 32-bit littleendian number as gzip does. |
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size_append = printf $(shell \ |
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dec_size=0; \ for F in $1; do \ |
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fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \ |
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dec_size=$$(expr $$dec_size + $$fsize); \ done; \ |
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printf "%08x " $$dec_size | \ sed 's/\(..\)/\1 /g' | { \ read ch0 ch1 ch2 ch3; \ for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \ printf '%s%03o' '\\' $$((0x$$ch)); \ done; \ } \ |
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) quiet_cmd_bzip2 = BZIP2 $@ cmd_bzip2 = (cat $(filter-out FORCE,$^) | \ bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ (rm -f $@ ; false) |
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# Lzma # --------------------------------------------------------------------------- quiet_cmd_lzma = LZMA $@ |
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cmd_lzma = (cat $(filter-out FORCE,$^) | \ lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ (rm -f $@ ; false) |
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quiet_cmd_lzo = LZO $@ |
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cmd_lzo = (cat $(filter-out FORCE,$^) | \ lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ (rm -f $@ ; false) |
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quiet_cmd_lz4 = LZ4 $@ cmd_lz4 = (cat $(filter-out FORCE,$^) | \ lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ (rm -f $@ ; false) |
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# U-Boot mkimage # --------------------------------------------------------------------------- MKIMAGE := $(srctree)/scripts/mkuboot.sh # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces # the number of overrides in arch makefiles UIMAGE_ARCH ?= $(SRCARCH) UIMAGE_COMPRESSION ?= $(if $(2),$(2),none) UIMAGE_OPTS-y ?= UIMAGE_TYPE ?= kernel UIMAGE_LOADADDR ?= arch_must_set_this UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR) UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)' UIMAGE_IN ?= $< UIMAGE_OUT ?= $@ quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT) cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \ -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \ -T $(UIMAGE_TYPE) \ -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \ -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT) |
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# XZ # --------------------------------------------------------------------------- # Use xzkern to compress the kernel image and xzmisc to compress other things. # # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage # of the kernel decompressor. A BCJ filter is used if it is available for # the target architecture. xzkern also appends uncompressed size of the data # using size_append. The .xz format has the size information available at # the end of the file too, but it's in more complex format and it's good to # avoid changing the part of the boot code that reads the uncompressed size. # Note that the bytes added by size_append will make the xz tool think that # the file is corrupt. This is expected. # # xzmisc doesn't use size_append, so it can be used to create normal .xz # files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very # big dictionary would increase the memory usage too much in the multi-call # decompression mode. A BCJ filter isn't used either. quiet_cmd_xzkern = XZKERN $@ cmd_xzkern = (cat $(filter-out FORCE,$^) | \ sh $(srctree)/scripts/xz_wrap.sh && \ $(call size_append, $(filter-out FORCE,$^))) > $@ || \ (rm -f $@ ; false) quiet_cmd_xzmisc = XZMISC $@ cmd_xzmisc = (cat $(filter-out FORCE,$^) | \ xz --check=crc32 --lzma2=dict=1MiB) > $@ || \ (rm -f $@ ; false) |
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# ASM offsets # --------------------------------------------------------------------------- # Default sed regexp - multiline due to syntax constraints |
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# # Use [:space:] because LLVM's integrated assembler inserts <tab> around # the .ascii directive whereas GCC keeps the <space> as-is. |
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define sed-offsets |
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's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \ /^->/{s:->#\(.*\):/* \1 */:; \ |
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s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \ |
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s:->::; p;}' |
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endef # Use filechk to avoid rebuilds when a header changes, but the resulting file # does not define filechk_offsets (set -e; \ echo "#ifndef $2"; \ echo "#define $2"; \ echo "/*"; \ echo " * DO NOT MODIFY."; \ echo " *"; \ echo " * This file was generated by Kbuild"; \ echo " */"; \ echo ""; \ |
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sed -ne $(sed-offsets) < $<; \ |
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echo ""; \ echo "#endif" ) endef |