| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame] | 1 | # Backward compatibility |
| 2 | asflags-y += $(EXTRA_AFLAGS) |
| 3 | ccflags-y += $(EXTRA_CFLAGS) |
| 4 | cppflags-y += $(EXTRA_CPPFLAGS) |
| 5 | ldflags-y += $(EXTRA_LDFLAGS) |
| 6 | |
| 7 | # |
| 8 | # flags that take effect in sub directories |
| 9 | export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y) |
| 10 | export 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 | |
| 18 | obj-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 | |
| 23 | lib-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. |
| 36 | modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko)) |
| 37 | |
| 38 | __subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y))) |
| 39 | subdir-y += $(__subdir-y) |
| 40 | __subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m))) |
| 41 | subdir-m += $(__subdir-m) |
| 42 | obj-y := $(patsubst %/, %/built-in.o, $(obj-y)) |
| 43 | obj-m := $(filter-out %/, $(obj-m)) |
| 44 | |
| 45 | # Subdirectories we need to descend into |
| 46 | |
| 47 | subdir-ym := $(sort $(subdir-y) $(subdir-m)) |
| 48 | |
| 49 | # if $(foo-objs) exists, foo.o is a composite object |
| 50 | multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m)))) |
| 51 | multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m)))) |
| 52 | multi-used := $(multi-used-y) $(multi-used-m) |
| 53 | single-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) |
| 57 | multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y))) |
| 58 | multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y))) |
| 59 | multi-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 |
| 63 | subdir-obj-y := $(filter %/built-in.o, $(obj-y)) |
| 64 | |
| 65 | # $(obj-dirs) is a list of directories that contain object files |
| 66 | obj-dirs := $(dir $(multi-objs) $(obj-y)) |
| 67 | |
| 68 | # Replace multi-part objects by their individual parts, look at local dir only |
| 69 | 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) |
| 70 | real-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 | |
| 74 | extra-y := $(addprefix $(obj)/,$(extra-y)) |
| 75 | always := $(addprefix $(obj)/,$(always)) |
| 76 | targets := $(addprefix $(obj)/,$(targets)) |
| 77 | modorder := $(addprefix $(obj)/,$(modorder)) |
| 78 | obj-y := $(addprefix $(obj)/,$(obj-y)) |
| 79 | obj-m := $(addprefix $(obj)/,$(obj-m)) |
| 80 | lib-y := $(addprefix $(obj)/,$(lib-y)) |
| 81 | subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y)) |
| 82 | real-objs-y := $(addprefix $(obj)/,$(real-objs-y)) |
| 83 | real-objs-m := $(addprefix $(obj)/,$(real-objs-m)) |
| 84 | single-used-m := $(addprefix $(obj)/,$(single-used-m)) |
| 85 | multi-used-y := $(addprefix $(obj)/,$(multi-used-y)) |
| 86 | multi-used-m := $(addprefix $(obj)/,$(multi-used-m)) |
| 87 | multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y)) |
| 88 | multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m)) |
| 89 | subdir-ym := $(addprefix $(obj)/,$(subdir-ym)) |
| 90 | obj-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. |
| 99 | name-fix = $(subst $(comma),_,$(subst -,_,$1)) |
| 100 | basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))" |
| 101 | modname_flags = $(if $(filter 1,$(words $(modname))),\ |
| 102 | -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))") |
| 103 | |
| 104 | orig_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 | # |
| 116 | ifeq ($(CONFIG_GCOV_KERNEL),y) |
| 117 | _c_flags += $(if $(patsubst n%,, \ |
| 118 | $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \ |
| 119 | $(CFLAGS_GCOV)) |
| 120 | endif |
| 121 | |
| 122 | # |
| 123 | # Enable address sanitizer flags for kernel except some files or directories |
| 124 | # we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE) |
| 125 | # |
| 126 | ifeq ($(CONFIG_KASAN),y) |
| 127 | _c_flags += $(if $(patsubst n%,, \ |
| 128 | $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \ |
| 129 | $(CFLAGS_KASAN)) |
| 130 | endif |
| 131 | |
| 132 | # If building the kernel in a separate objtree expand all occurrences |
| 133 | # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/'). |
| 134 | |
| 135 | ifeq ($(KBUILD_SRC),) |
| 136 | __c_flags = $(_c_flags) |
| 137 | __a_flags = $(_a_flags) |
| 138 | __cpp_flags = $(_cpp_flags) |
| 139 | else |
| 140 | |
| 141 | # -I$(obj) locates generated .h files |
| 142 | # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files |
| 143 | # and locates generated .h files |
| 144 | # FIXME: Replace both with specific CFLAGS* statements in the makefiles |
| 145 | __c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags) |
| 146 | __a_flags = $(call flags,_a_flags) |
| 147 | __cpp_flags = $(call flags,_cpp_flags) |
| 148 | endif |
| 149 | |
| 150 | c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ |
| 151 | $(__c_flags) $(modkern_cflags) \ |
| 152 | -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags) |
| 153 | |
| 154 | a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ |
| 155 | $(__a_flags) $(modkern_aflags) |
| 156 | |
| 157 | cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ |
| 158 | $(__cpp_flags) |
| 159 | |
| 160 | ld_flags = $(LDFLAGS) $(ldflags-y) |
| 161 | |
| 162 | dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \ |
| 163 | -I$(srctree)/arch/$(SRCARCH)/boot/dts \ |
| 164 | -I$(srctree)/arch/$(SRCARCH)/boot/dts/include \ |
| 165 | -I$(srctree)/drivers/of/testcase-data \ |
| 166 | -undef -D__DTS__ |
| 167 | |
| 168 | # Finds the multi-part object the current object will be linked into |
| 169 | modname-multi = $(sort $(foreach m,$(multi-used),\ |
| 170 | $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=)))) |
| 171 | |
| 172 | # Useful for describing the dependency of composite objects |
| 173 | # Usage: |
| 174 | # $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add) |
| 175 | define multi_depend |
| 176 | $(foreach m, $(notdir $1), \ |
| 177 | $(eval $(obj)/$m: \ |
| 178 | $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s))))))) |
| 179 | endef |
| 180 | |
| 181 | ifdef REGENERATE_PARSERS |
| 182 | |
| 183 | # GPERF |
| 184 | # --------------------------------------------------------------------------- |
| 185 | quiet_cmd_gperf = GPERF $@ |
| 186 | cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $< |
| 187 | |
| 188 | .PRECIOUS: $(src)/%.hash.c_shipped |
| 189 | $(src)/%.hash.c_shipped: $(src)/%.gperf |
| 190 | $(call cmd,gperf) |
| 191 | |
| 192 | # LEX |
| 193 | # --------------------------------------------------------------------------- |
| 194 | LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy) |
| 195 | |
| 196 | quiet_cmd_flex = LEX $@ |
| 197 | cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $< |
| 198 | |
| 199 | .PRECIOUS: $(src)/%.lex.c_shipped |
| 200 | $(src)/%.lex.c_shipped: $(src)/%.l |
| 201 | $(call cmd,flex) |
| 202 | |
| 203 | # YACC |
| 204 | # --------------------------------------------------------------------------- |
| 205 | YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy) |
| 206 | |
| 207 | quiet_cmd_bison = YACC $@ |
| 208 | cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $< |
| 209 | |
| 210 | .PRECIOUS: $(src)/%.tab.c_shipped |
| 211 | $(src)/%.tab.c_shipped: $(src)/%.y |
| 212 | $(call cmd,bison) |
| 213 | |
| 214 | quiet_cmd_bison_h = YACC $@ |
| 215 | cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $< |
| 216 | |
| 217 | .PRECIOUS: $(src)/%.tab.h_shipped |
| 218 | $(src)/%.tab.h_shipped: $(src)/%.y |
| 219 | $(call cmd,bison_h) |
| 220 | |
| 221 | endif |
| 222 | |
| 223 | # Shipped files |
| 224 | # =========================================================================== |
| 225 | |
| 226 | quiet_cmd_shipped = SHIPPED $@ |
| 227 | cmd_shipped = cat $< > $@ |
| 228 | |
| 229 | $(obj)/%: $(src)/%_shipped |
| 230 | $(call cmd,shipped) |
| 231 | |
| 232 | # Commands useful for building a boot image |
| 233 | # =========================================================================== |
| 234 | # |
| 235 | # Use as following: |
| 236 | # |
| 237 | # target: source(s) FORCE |
| 238 | # $(if_changed,ld/objcopy/gzip) |
| 239 | # |
| 240 | # and add target to extra-y so that we know we have to |
| 241 | # read in the saved command line |
| 242 | |
| 243 | # Linking |
| 244 | # --------------------------------------------------------------------------- |
| 245 | |
| 246 | quiet_cmd_ld = LD $@ |
| 247 | cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \ |
| 248 | $(filter-out FORCE,$^) -o $@ |
| 249 | |
| 250 | # Objcopy |
| 251 | # --------------------------------------------------------------------------- |
| 252 | |
| 253 | quiet_cmd_objcopy = OBJCOPY $@ |
| 254 | cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ |
| 255 | |
| 256 | # Gzip |
| 257 | # --------------------------------------------------------------------------- |
| 258 | |
| 259 | quiet_cmd_gzip = GZIP $@ |
| 260 | cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \ |
| 261 | (rm -f $@ ; false) |
| 262 | |
| 263 | # DTC |
| 264 | # --------------------------------------------------------------------------- |
| 265 | |
| 266 | # Generate an assembly file to wrap the output of the device tree compiler |
| 267 | quiet_cmd_dt_S_dtb= DTB $@ |
| 268 | cmd_dt_S_dtb= \ |
| 269 | ( \ |
| 270 | echo '\#include <asm-generic/vmlinux.lds.h>'; \ |
| 271 | echo '.section .dtb.init.rodata,"a"'; \ |
| 272 | echo '.balign STRUCT_ALIGNMENT'; \ |
| 273 | echo '.global __dtb_$(*F)_begin'; \ |
| 274 | echo '__dtb_$(*F)_begin:'; \ |
| 275 | echo '.incbin "$<" '; \ |
| 276 | echo '__dtb_$(*F)_end:'; \ |
| 277 | echo '.global __dtb_$(*F)_end'; \ |
| 278 | echo '.balign STRUCT_ALIGNMENT'; \ |
| 279 | ) > $@ |
| 280 | |
| 281 | $(obj)/%.dtb.S: $(obj)/%.dtb |
| 282 | $(call cmd,dt_S_dtb) |
| 283 | |
| 284 | quiet_cmd_dtc = DTC $@ |
| 285 | cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \ |
| 286 | $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \ |
| 287 | $(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 \ |
| 288 | -i $(dir $<) $(DTC_FLAGS) \ |
| 289 | -d $(depfile).dtc.tmp $(dtc-tmp) ; \ |
| 290 | cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) |
| 291 | |
| 292 | $(obj)/%.dtb: $(src)/%.dts FORCE |
| 293 | $(call if_changed_dep,dtc) |
| 294 | |
| 295 | dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp) |
| 296 | |
| 297 | # Bzip2 |
| 298 | # --------------------------------------------------------------------------- |
| 299 | |
| 300 | # Bzip2 and LZMA do not include size in file... so we have to fake that; |
| 301 | # append the size as a 32-bit littleendian number as gzip does. |
| 302 | size_append = printf $(shell \ |
| 303 | dec_size=0; \ |
| 304 | for F in $1; do \ |
| 305 | fsize=$$(stat -c "%s" $$F); \ |
| 306 | dec_size=$$(expr $$dec_size + $$fsize); \ |
| 307 | done; \ |
| 308 | printf "%08x\n" $$dec_size | \ |
| 309 | sed 's/\(..\)/\1 /g' | { \ |
| 310 | read ch0 ch1 ch2 ch3; \ |
| 311 | for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \ |
| 312 | printf '%s%03o' '\\' $$((0x$$ch)); \ |
| 313 | done; \ |
| 314 | } \ |
| 315 | ) |
| 316 | |
| 317 | quiet_cmd_bzip2 = BZIP2 $@ |
| 318 | cmd_bzip2 = (cat $(filter-out FORCE,$^) | \ |
| 319 | bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ |
| 320 | (rm -f $@ ; false) |
| 321 | |
| 322 | # Lzma |
| 323 | # --------------------------------------------------------------------------- |
| 324 | |
| 325 | quiet_cmd_lzma = LZMA $@ |
| 326 | cmd_lzma = (cat $(filter-out FORCE,$^) | \ |
| 327 | lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ |
| 328 | (rm -f $@ ; false) |
| 329 | |
| 330 | quiet_cmd_lzo = LZO $@ |
| 331 | cmd_lzo = (cat $(filter-out FORCE,$^) | \ |
| 332 | lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ |
| 333 | (rm -f $@ ; false) |
| 334 | |
| 335 | quiet_cmd_lz4 = LZ4 $@ |
| 336 | cmd_lz4 = (cat $(filter-out FORCE,$^) | \ |
| 337 | lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ |
| 338 | (rm -f $@ ; false) |
| 339 | |
| 340 | # U-Boot mkimage |
| 341 | # --------------------------------------------------------------------------- |
| 342 | |
| 343 | MKIMAGE := $(srctree)/scripts/mkuboot.sh |
| 344 | |
| 345 | # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces |
| 346 | # the number of overrides in arch makefiles |
| 347 | UIMAGE_ARCH ?= $(SRCARCH) |
| 348 | UIMAGE_COMPRESSION ?= $(if $(2),$(2),none) |
| 349 | UIMAGE_OPTS-y ?= |
| 350 | UIMAGE_TYPE ?= kernel |
| 351 | UIMAGE_LOADADDR ?= arch_must_set_this |
| 352 | UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR) |
| 353 | UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)' |
| 354 | UIMAGE_IN ?= $< |
| 355 | UIMAGE_OUT ?= $@ |
| 356 | |
| 357 | quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT) |
| 358 | cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \ |
| 359 | -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \ |
| 360 | -T $(UIMAGE_TYPE) \ |
| 361 | -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \ |
| 362 | -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT) |
| 363 | |
| 364 | # XZ |
| 365 | # --------------------------------------------------------------------------- |
| 366 | # Use xzkern to compress the kernel image and xzmisc to compress other things. |
| 367 | # |
| 368 | # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage |
| 369 | # of the kernel decompressor. A BCJ filter is used if it is available for |
| 370 | # the target architecture. xzkern also appends uncompressed size of the data |
| 371 | # using size_append. The .xz format has the size information available at |
| 372 | # the end of the file too, but it's in more complex format and it's good to |
| 373 | # avoid changing the part of the boot code that reads the uncompressed size. |
| 374 | # Note that the bytes added by size_append will make the xz tool think that |
| 375 | # the file is corrupt. This is expected. |
| 376 | # |
| 377 | # xzmisc doesn't use size_append, so it can be used to create normal .xz |
| 378 | # files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very |
| 379 | # big dictionary would increase the memory usage too much in the multi-call |
| 380 | # decompression mode. A BCJ filter isn't used either. |
| 381 | quiet_cmd_xzkern = XZKERN $@ |
| 382 | cmd_xzkern = (cat $(filter-out FORCE,$^) | \ |
| 383 | sh $(srctree)/scripts/xz_wrap.sh && \ |
| 384 | $(call size_append, $(filter-out FORCE,$^))) > $@ || \ |
| 385 | (rm -f $@ ; false) |
| 386 | |
| 387 | quiet_cmd_xzmisc = XZMISC $@ |
| 388 | cmd_xzmisc = (cat $(filter-out FORCE,$^) | \ |
| 389 | xz --check=crc32 --lzma2=dict=1MiB) > $@ || \ |
| 390 | (rm -f $@ ; false) |