| 1 | # ==========================================================================
|
| 2 | # Building
|
| 3 | # ==========================================================================
|
| 4 |
|
| 5 | src := $(obj)
|
| 6 |
|
| 7 | PHONY := __build
|
| 8 | __build:
|
| 9 |
|
| 10 | # Init all relevant variables used in kbuild files so
|
| 11 | # 1) they have correct type
|
| 12 | # 2) they do not inherit any value from the environment
|
| 13 | obj-y :=
|
| 14 | obj-m :=
|
| 15 | lib-y :=
|
| 16 | lib-m :=
|
| 17 | always :=
|
| 18 | targets :=
|
| 19 | subdir-y :=
|
| 20 | subdir-m :=
|
| 21 | EXTRA_AFLAGS :=
|
| 22 | EXTRA_CFLAGS :=
|
| 23 | EXTRA_CPPFLAGS :=
|
| 24 | EXTRA_LDFLAGS :=
|
| 25 | asflags-y :=
|
| 26 | ccflags-y :=
|
| 27 | cppflags-y :=
|
| 28 | ldflags-y :=
|
| 29 |
|
| 30 | subdir-asflags-y :=
|
| 31 | subdir-ccflags-y :=
|
| 32 |
|
| 33 | # Read auto.conf if it exists, otherwise ignore
|
| 34 | -include include/config/auto.conf
|
| 35 |
|
| 36 | include scripts/Kbuild.include
|
| 37 |
|
| 38 | # For backward compatibility check that these variables do not change
|
| 39 | save-cflags := $(CFLAGS)
|
| 40 |
|
| 41 | # The filename Kbuild has precedence over Makefile
|
| 42 | kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
|
| 43 | kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
|
| 44 | include $(kbuild-file)
|
| 45 |
|
| 46 | # If the save-* variables changed error out
|
| 47 | ifeq ($(KBUILD_NOPEDANTIC),)
|
| 48 | ifneq ("$(save-cflags)","$(CFLAGS)")
|
| 49 | $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y)
|
| 50 | endif
|
| 51 | endif
|
| 52 |
|
| 53 | include scripts/Makefile.lib
|
| 54 |
|
| 55 | ifdef host-progs
|
| 56 | ifneq ($(hostprogs-y),$(host-progs))
|
| 57 | $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
|
| 58 | hostprogs-y += $(host-progs)
|
| 59 | endif
|
| 60 | endif
|
| 61 |
|
| 62 | # Do not include host rules unless needed
|
| 63 | ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),)
|
| 64 | include scripts/Makefile.host
|
| 65 | endif
|
| 66 |
|
| 67 | ifneq ($(KBUILD_SRC),)
|
| 68 | # Create output directory if not already present
|
| 69 | _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
|
| 70 |
|
| 71 | # Create directories for object files if directory does not exist
|
| 72 | # Needed when obj-y := dir/file.o syntax is used
|
| 73 | _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
|
| 74 | endif
|
| 75 |
|
| 76 | ifndef obj
|
| 77 | $(warning kbuild: Makefile.build is included improperly)
|
| 78 | endif
|
| 79 |
|
| 80 | # ===========================================================================
|
| 81 |
|
| 82 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
|
| 83 | lib-target := $(obj)/lib.a
|
| 84 | obj-y += $(obj)/lib-ksyms.o
|
| 85 | endif
|
| 86 |
|
| 87 | ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),)
|
| 88 | builtin-target := $(obj)/built-in.o
|
| 89 | endif
|
| 90 |
|
| 91 | modorder-target := $(obj)/modules.order
|
| 92 |
|
| 93 | # We keep a list of all modules in $(MODVERDIR)
|
| 94 |
|
| 95 | __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
|
| 96 | $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
|
| 97 | $(subdir-ym) $(always)
|
| 98 | @:
|
| 99 |
|
| 100 | # Linus' kernel sanity checking tool
|
| 101 | ifneq ($(KBUILD_CHECKSRC),0)
|
| 102 | ifeq ($(KBUILD_CHECKSRC),2)
|
| 103 | quiet_cmd_force_checksrc = CHECK $<
|
| 104 | cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
|
| 105 | else
|
| 106 | quiet_cmd_checksrc = CHECK $<
|
| 107 | cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
|
| 108 | endif
|
| 109 | endif
|
| 110 |
|
| 111 | # Do section mismatch analysis for each module/built-in.o
|
| 112 | ifdef CONFIG_DEBUG_SECTION_MISMATCH
|
| 113 | cmd_secanalysis = ; scripts/mod/modpost $@
|
| 114 | endif
|
| 115 |
|
| 116 | # Compile C sources (.c)
|
| 117 | # ---------------------------------------------------------------------------
|
| 118 |
|
| 119 | # Default is built-in, unless we know otherwise
|
| 120 | modkern_cflags = \
|
| 121 | $(if $(part-of-module), \
|
| 122 | $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
|
| 123 | $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
|
| 124 | quiet_modtag := $(empty) $(empty)
|
| 125 |
|
| 126 | $(real-objs-m) : part-of-module := y
|
| 127 | $(real-objs-m:.o=.i) : part-of-module := y
|
| 128 | $(real-objs-m:.o=.s) : part-of-module := y
|
| 129 | $(real-objs-m:.o=.lst): part-of-module := y
|
| 130 |
|
| 131 | $(real-objs-m) : quiet_modtag := [M]
|
| 132 | $(real-objs-m:.o=.i) : quiet_modtag := [M]
|
| 133 | $(real-objs-m:.o=.s) : quiet_modtag := [M]
|
| 134 | $(real-objs-m:.o=.lst): quiet_modtag := [M]
|
| 135 |
|
| 136 | $(obj-m) : quiet_modtag := [M]
|
| 137 |
|
| 138 | # Default for not multi-part modules
|
| 139 | modname = $(basetarget)
|
| 140 |
|
| 141 | $(multi-objs-m) : modname = $(modname-multi)
|
| 142 | $(multi-objs-m:.o=.i) : modname = $(modname-multi)
|
| 143 | $(multi-objs-m:.o=.s) : modname = $(modname-multi)
|
| 144 | $(multi-objs-m:.o=.lst) : modname = $(modname-multi)
|
| 145 | $(multi-objs-y) : modname = $(modname-multi)
|
| 146 | $(multi-objs-y:.o=.i) : modname = $(modname-multi)
|
| 147 | $(multi-objs-y:.o=.s) : modname = $(modname-multi)
|
| 148 | $(multi-objs-y:.o=.lst) : modname = $(modname-multi)
|
| 149 |
|
| 150 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
|
| 151 | cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
|
| 152 |
|
| 153 | $(obj)/%.s: $(src)/%.c FORCE
|
| 154 | $(call if_changed_dep,cc_s_c)
|
| 155 |
|
| 156 | quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
|
| 157 | cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
|
| 158 |
|
| 159 | $(obj)/%.i: $(src)/%.c FORCE
|
| 160 | $(call if_changed_dep,cpp_i_c)
|
| 161 |
|
| 162 | # These mirror gensymtypes_S and co below, keep them in synch.
|
| 163 | cmd_gensymtypes_c = \
|
| 164 | $(CPP) -D__GENKSYMS__ $(c_flags) $< | \
|
| 165 | $(GENKSYMS) $(if $(1), -T $(2)) \
|
| 166 | $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
|
| 167 | $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
|
| 168 | $(if $(KBUILD_PRESERVE),-p) \
|
| 169 | -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
|
| 170 |
|
| 171 | quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
|
| 172 | cmd_cc_symtypes_c = \
|
| 173 | set -e; \
|
| 174 | $(call cmd_gensymtypes_c,true,$@) >/dev/null; \
|
| 175 | test -s $@ || rm -f $@
|
| 176 |
|
| 177 | $(obj)/%.symtypes : $(src)/%.c FORCE
|
| 178 | $(call cmd,cc_symtypes_c)
|
| 179 |
|
| 180 | # LLVM assembly
|
| 181 | # Generate .ll files from .c
|
| 182 | quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@
|
| 183 | cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $<
|
| 184 |
|
| 185 | $(obj)/%.ll: $(src)/%.c FORCE
|
| 186 | $(call if_changed_dep,cc_ll_c)
|
| 187 |
|
| 188 | # C (.c) files
|
| 189 | # The C file is compiled and updated dependency information is generated.
|
| 190 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
|
| 191 |
|
| 192 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
|
| 193 |
|
| 194 | ifndef CONFIG_MODVERSIONS
|
| 195 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
|
| 196 |
|
| 197 | else
|
| 198 | # When module versioning is enabled the following steps are executed:
|
| 199 | # o compile a .tmp_<file>.o from <file>.c
|
| 200 | # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
|
| 201 | # not export symbols, we just rename .tmp_<file>.o to <file>.o and
|
| 202 | # are done.
|
| 203 | # o otherwise, we calculate symbol versions using the good old
|
| 204 | # genksyms on the preprocessed source and postprocess them in a way
|
| 205 | # that they are usable as a linker script
|
| 206 | # o generate <file>.o from .tmp_<file>.o using the linker to
|
| 207 | # replace the unresolved symbols __crc_exported_symbol with
|
| 208 | # the actual value of the checksum generated by genksyms
|
| 209 |
|
| 210 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
|
| 211 |
|
| 212 | cmd_modversions_c = \
|
| 213 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
|
| 214 | $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
|
| 215 | > $(@D)/.tmp_$(@F:.o=.ver); \
|
| 216 | \
|
| 217 | $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
|
| 218 | -T $(@D)/.tmp_$(@F:.o=.ver); \
|
| 219 | rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
|
| 220 | else \
|
| 221 | mv -f $(@D)/.tmp_$(@F) $@; \
|
| 222 | fi;
|
| 223 | endif
|
| 224 |
|
| 225 | ifdef CONFIG_FTRACE_MCOUNT_RECORD
|
| 226 | ifdef BUILD_C_RECORDMCOUNT
|
| 227 | ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
|
| 228 | RECORDMCOUNT_FLAGS = -w
|
| 229 | endif
|
| 230 | # Due to recursion, we must skip empty.o.
|
| 231 | # The empty.o file is created in the make process in order to determine
|
| 232 | # the target endianness and word size. It is made before all other C
|
| 233 | # files, including recordmcount.
|
| 234 | sub_cmd_record_mcount = \
|
| 235 | if [ $(@) != "scripts/mod/empty.o" ]; then \
|
| 236 | $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
|
| 237 | fi;
|
| 238 | recordmcount_source := $(srctree)/scripts/recordmcount.c \
|
| 239 | $(srctree)/scripts/recordmcount.h
|
| 240 | else
|
| 241 | sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
|
| 242 | "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
|
| 243 | "$(if $(CONFIG_64BIT),64,32)" \
|
| 244 | "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
|
| 245 | "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
|
| 246 | "$(if $(part-of-module),1,0)" "$(@)";
|
| 247 | recordmcount_source := $(srctree)/scripts/recordmcount.pl
|
| 248 | endif # BUILD_C_RECORDMCOUNT
|
| 249 | cmd_record_mcount = \
|
| 250 | if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \
|
| 251 | "$(CC_FLAGS_FTRACE)" ]; then \
|
| 252 | $(sub_cmd_record_mcount) \
|
| 253 | fi;
|
| 254 | endif # CONFIG_FTRACE_MCOUNT_RECORD
|
| 255 |
|
| 256 | ifdef CONFIG_STACK_VALIDATION
|
| 257 | ifneq ($(SKIP_STACK_VALIDATION),1)
|
| 258 |
|
| 259 | __objtool_obj := $(objtree)/tools/objtool/objtool
|
| 260 |
|
| 261 | objtool_args = check
|
| 262 | ifndef CONFIG_FRAME_POINTER
|
| 263 | objtool_args += --no-fp
|
| 264 | endif
|
| 265 |
|
| 266 | # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
|
| 267 | # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
|
| 268 | # 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
|
| 269 | cmd_objtool = $(if $(patsubst y%,, \
|
| 270 | $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
|
| 271 | $(__objtool_obj) $(objtool_args) "$(@)";)
|
| 272 | objtool_obj = $(if $(patsubst y%,, \
|
| 273 | $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
|
| 274 | $(__objtool_obj))
|
| 275 |
|
| 276 | endif # SKIP_STACK_VALIDATION
|
| 277 | endif # CONFIG_STACK_VALIDATION
|
| 278 |
|
| 279 | define rule_cc_o_c
|
| 280 | $(call echo-cmd,checksrc) $(cmd_checksrc) \
|
| 281 | $(call cmd_and_fixdep,cc_o_c) \
|
| 282 | $(cmd_modversions_c) \
|
| 283 | $(call echo-cmd,objtool) $(cmd_objtool) \
|
| 284 | $(call echo-cmd,record_mcount) $(cmd_record_mcount)
|
| 285 | endef
|
| 286 |
|
| 287 | define rule_as_o_S
|
| 288 | $(call cmd_and_fixdep,as_o_S) \
|
| 289 | $(cmd_modversions_S) \
|
| 290 | $(call echo-cmd,objtool) $(cmd_objtool)
|
| 291 | endef
|
| 292 |
|
| 293 | # List module undefined symbols (or empty line if not enabled)
|
| 294 | ifdef CONFIG_TRIM_UNUSED_KSYMS
|
| 295 | cmd_undef_syms = $(NM) $@ | sed -n 's/^ \+U //p' | xargs echo
|
| 296 | else
|
| 297 | cmd_undef_syms = echo
|
| 298 | endif
|
| 299 |
|
| 300 | # Built-in and composite module parts
|
| 301 | $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_obj) FORCE
|
| 302 | $(call cmd,force_checksrc)
|
| 303 | $(call if_changed_rule,cc_o_c)
|
| 304 |
|
| 305 | # Single-part modules are special since we need to mark them in $(MODVERDIR)
|
| 306 |
|
| 307 | $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_obj) FORCE
|
| 308 | $(call cmd,force_checksrc)
|
| 309 | $(call if_changed_rule,cc_o_c)
|
| 310 | @{ echo $(@:.o=.ko); echo $@; \
|
| 311 | $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
|
| 312 |
|
| 313 | quiet_cmd_cc_lst_c = MKLST $@
|
| 314 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
|
| 315 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
|
| 316 | System.map $(OBJDUMP) > $@
|
| 317 |
|
| 318 | $(obj)/%.lst: $(src)/%.c FORCE
|
| 319 | $(call if_changed_dep,cc_lst_c)
|
| 320 |
|
| 321 | # Compile assembler sources (.S)
|
| 322 | # ---------------------------------------------------------------------------
|
| 323 |
|
| 324 | modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
|
| 325 |
|
| 326 | $(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
|
| 327 | $(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
|
| 328 |
|
| 329 | # .S file exports must have their C prototypes defined in asm/asm-prototypes.h
|
| 330 | # or a file that it includes, in order to get versioned symbols. We build a
|
| 331 | # dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
|
| 332 | # the .S file (with trailing ';'), and run genksyms on that, to extract vers.
|
| 333 | #
|
| 334 | # This is convoluted. The .S file must first be preprocessed to run guards and
|
| 335 | # expand names, then the resulting exports must be constructed into plain
|
| 336 | # EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
|
| 337 | # to make the genksyms input.
|
| 338 | #
|
| 339 | # These mirror gensymtypes_c and co above, keep them in synch.
|
| 340 | cmd_gensymtypes_S = \
|
| 341 | (echo "\#include <linux/kernel.h>" ; \
|
| 342 | echo "\#include <asm/asm-prototypes.h>" ; \
|
| 343 | $(CPP) $(a_flags) $< | \
|
| 344 | grep "\<___EXPORT_SYMBOL\>" | \
|
| 345 | sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \
|
| 346 | $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \
|
| 347 | $(GENKSYMS) $(if $(1), -T $(2)) \
|
| 348 | $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
|
| 349 | $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
|
| 350 | $(if $(KBUILD_PRESERVE),-p) \
|
| 351 | -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
|
| 352 |
|
| 353 | quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
|
| 354 | cmd_cc_symtypes_S = \
|
| 355 | set -e; \
|
| 356 | $(call cmd_gensymtypes_S,true,$@) >/dev/null; \
|
| 357 | test -s $@ || rm -f $@
|
| 358 |
|
| 359 | $(obj)/%.symtypes : $(src)/%.S FORCE
|
| 360 | $(call cmd,cc_symtypes_S)
|
| 361 |
|
| 362 |
|
| 363 | quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
|
| 364 | cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
|
| 365 |
|
| 366 | $(obj)/%.s: $(src)/%.S FORCE
|
| 367 | $(call if_changed_dep,cpp_s_S)
|
| 368 |
|
| 369 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@
|
| 370 |
|
| 371 | ifndef CONFIG_MODVERSIONS
|
| 372 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
|
| 373 |
|
| 374 | else
|
| 375 |
|
| 376 | ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h)
|
| 377 |
|
| 378 | ifeq ($(ASM_PROTOTYPES),)
|
| 379 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
|
| 380 |
|
| 381 | else
|
| 382 |
|
| 383 | # versioning matches the C process described above, with difference that
|
| 384 | # we parse asm-prototypes.h C header to get function definitions.
|
| 385 |
|
| 386 | cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $<
|
| 387 |
|
| 388 | cmd_modversions_S = \
|
| 389 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
|
| 390 | $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
|
| 391 | > $(@D)/.tmp_$(@F:.o=.ver); \
|
| 392 | \
|
| 393 | $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
|
| 394 | -T $(@D)/.tmp_$(@F:.o=.ver); \
|
| 395 | rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
|
| 396 | else \
|
| 397 | mv -f $(@D)/.tmp_$(@F) $@; \
|
| 398 | fi;
|
| 399 | endif
|
| 400 | endif
|
| 401 |
|
| 402 | $(obj)/%.o: $(src)/%.S $(objtool_obj) FORCE
|
| 403 | $(call if_changed_rule,as_o_S)
|
| 404 |
|
| 405 | targets += $(real-objs-y) $(real-objs-m) $(lib-y)
|
| 406 | targets += $(extra-y) $(MAKECMDGOALS) $(always)
|
| 407 |
|
| 408 | # Linker scripts preprocessor (.lds.S -> .lds)
|
| 409 | # ---------------------------------------------------------------------------
|
| 410 | quiet_cmd_cpp_lds_S = LDS $@
|
| 411 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
|
| 412 | -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
|
| 413 |
|
| 414 | $(obj)/%.lds: $(src)/%.lds.S FORCE
|
| 415 | $(call if_changed_dep,cpp_lds_S)
|
| 416 |
|
| 417 | # ASN.1 grammar
|
| 418 | # ---------------------------------------------------------------------------
|
| 419 | quiet_cmd_asn1_compiler = ASN.1 $@
|
| 420 | cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
|
| 421 | $(subst .h,.c,$@) $(subst .c,.h,$@)
|
| 422 |
|
| 423 | .PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h
|
| 424 |
|
| 425 | $(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
|
| 426 | $(call cmd,asn1_compiler)
|
| 427 |
|
| 428 | # Build the compiled-in targets
|
| 429 | # ---------------------------------------------------------------------------
|
| 430 |
|
| 431 | # To build objects in subdirs, we need to descend into the directories
|
| 432 | $(sort $(subdir-obj-y)): $(subdir-ym) ;
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| 433 |
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| 434 | #
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| 435 | # Rule to compile a set of .o files into one .o file
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| 436 | #
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| 437 | ifdef builtin-target
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| 438 |
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| 439 | ifdef CONFIG_THIN_ARCHIVES
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| 440 | cmd_make_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS)
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| 441 | cmd_make_empty_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS)
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| 442 | quiet_cmd_link_o_target = AR $@
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| 443 | else
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| 444 | cmd_make_builtin = $(LD) $(ld_flags) -r -o
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| 445 | cmd_make_empty_builtin = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS)
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| 446 | quiet_cmd_link_o_target = LD $@
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| 447 | endif
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| 448 |
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| 449 | # If the list of objects to link is empty, just create an empty built-in.o
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| 450 | cmd_link_o_target = $(if $(strip $(obj-y)),\
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| 451 | $(cmd_make_builtin) $@ $(filter $(obj-y), $^) \
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| 452 | $(cmd_secanalysis),\
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| 453 | $(cmd_make_empty_builtin) $@)
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| 454 |
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| 455 | $(builtin-target): $(obj-y) FORCE
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| 456 | $(call if_changed,link_o_target)
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| 457 |
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| 458 | targets += $(builtin-target)
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| 459 | endif # builtin-target
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| 460 |
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| 461 | #
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| 462 | # Rule to create modules.order file
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| 463 | #
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| 464 | # Create commands to either record .ko file or cat modules.order from
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| 465 | # a subdirectory
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| 466 | modorder-cmds = \
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| 467 | $(foreach m, $(modorder), \
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| 468 | $(if $(filter %/modules.order, $m), \
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| 469 | cat $m;, echo kernel/$m;))
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| 470 |
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| 471 | $(modorder-target): $(subdir-ym) FORCE
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| 472 | $(Q)(cat /dev/null; $(modorder-cmds)) > $@
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| 473 |
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| 474 | #
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| 475 | # Rule to compile a set of .o files into one .a file
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| 476 | #
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| 477 | ifdef lib-target
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| 478 | quiet_cmd_link_l_target = AR $@
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| 479 |
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| 480 | ifdef CONFIG_THIN_ARCHIVES
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| 481 | cmd_link_l_target = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(lib-y)
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| 482 | else
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| 483 | cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
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| 484 | endif
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| 485 |
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| 486 | $(lib-target): $(lib-y) FORCE
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| 487 | $(call if_changed,link_l_target)
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| 488 |
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| 489 | targets += $(lib-target)
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| 490 |
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| 491 | dummy-object = $(obj)/.lib_exports.o
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| 492 | ksyms-lds = $(dot-target).lds
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| 493 | ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
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| 494 | ref_prefix = EXTERN(_
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| 495 | else
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| 496 | ref_prefix = EXTERN(
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| 497 | endif
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| 498 |
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| 499 | quiet_cmd_export_list = EXPORTS $@
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| 500 | cmd_export_list = $(OBJDUMP) -h $< | \
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| 501 | sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/$(ref_prefix)\1)/p' >$(ksyms-lds);\
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| 502 | rm -f $(dummy-object);\
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| 503 | echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\
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| 504 | $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\
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| 505 | rm $(dummy-object) $(ksyms-lds)
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| 506 |
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| 507 | $(obj)/lib-ksyms.o: $(lib-target) FORCE
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| 508 | $(call if_changed,export_list)
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| 509 |
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| 510 | targets += $(obj)/lib-ksyms.o
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| 511 |
|
| 512 | endif
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| 513 |
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| 514 | #
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| 515 | # Rule to link composite objects
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| 516 | #
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| 517 | # Composite objects are specified in kbuild makefile as follows:
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| 518 | # <composite-object>-objs := <list of .o files>
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| 519 | # or
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| 520 | # <composite-object>-y := <list of .o files>
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| 521 | # or
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| 522 | # <composite-object>-m := <list of .o files>
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| 523 | # The -m syntax only works if <composite object> is a module
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| 524 | link_multi_deps = \
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| 525 | $(filter $(addprefix $(obj)/, \
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| 526 | $($(subst $(obj)/,,$(@:.o=-objs))) \
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| 527 | $($(subst $(obj)/,,$(@:.o=-y))) \
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| 528 | $($(subst $(obj)/,,$(@:.o=-m)))), $^)
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| 529 |
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| 530 | cmd_link_multi-link = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
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| 531 |
|
| 532 | ifdef CONFIG_THIN_ARCHIVES
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| 533 | quiet_cmd_link_multi-y = AR $@
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| 534 | cmd_link_multi-y = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(link_multi_deps)
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| 535 | else
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| 536 | quiet_cmd_link_multi-y = LD $@
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| 537 | cmd_link_multi-y = $(cmd_link_multi-link)
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| 538 | endif
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| 539 |
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| 540 | quiet_cmd_link_multi-m = LD [M] $@
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| 541 | cmd_link_multi-m = $(cmd_link_multi-link)
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| 542 |
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| 543 | $(multi-used-y): FORCE
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| 544 | $(call if_changed,link_multi-y)
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| 545 | $(call multi_depend, $(multi-used-y), .o, -objs -y)
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| 546 |
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| 547 | $(multi-used-m): FORCE
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| 548 | $(call if_changed,link_multi-m)
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| 549 | @{ echo $(@:.o=.ko); echo $(link_multi_deps); \
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| 550 | $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
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| 551 | $(call multi_depend, $(multi-used-m), .o, -objs -y -m)
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| 552 |
|
| 553 | targets += $(multi-used-y) $(multi-used-m)
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| 554 |
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| 555 |
|
| 556 | # Descending
|
| 557 | # ---------------------------------------------------------------------------
|
| 558 |
|
| 559 | PHONY += $(subdir-ym)
|
| 560 | $(subdir-ym):
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| 561 | $(Q)$(MAKE) $(build)=$@
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| 562 |
|
| 563 | # Add FORCE to the prequisites of a target to force it to be always rebuilt.
|
| 564 | # ---------------------------------------------------------------------------
|
| 565 |
|
| 566 | PHONY += FORCE
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| 567 |
|
| 568 | FORCE:
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| 569 |
|
| 570 | # Read all saved command lines and dependencies for the $(targets) we
|
| 571 | # may be building above, using $(if_changed{,_dep}). As an
|
| 572 | # optimization, we don't need to read them if the target does not
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| 573 | # exist, we will rebuild anyway in that case.
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| 574 |
|
| 575 | targets := $(wildcard $(sort $(targets)))
|
| 576 | cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
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| 577 |
|
| 578 | ifneq ($(cmd_files),)
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| 579 | include $(cmd_files)
|
| 580 | endif
|
| 581 |
|
| 582 | # Declare the contents of the .PHONY variable as phony. We keep that
|
| 583 | # information in a variable se we can use it in if_changed and friends.
|
| 584 |
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| 585 | .PHONY: $(PHONY)
|