| # =========================================================================== |
| # Module versions |
| # =========================================================================== |
| # |
| # Stage one of module building created the following: |
| # a) The individual .o files used for the module |
| # b) A <module>.o file which is the .o files above linked together |
| # c) A <module>.mod file in $(MODVERDIR)/, listing the name of the |
| # the preliminary <module>.o file, plus all .o files |
| |
| # Stage 2 is handled by this file and does the following |
| # 1) Find all modules from the files listed in $(MODVERDIR)/ |
| # 2) modpost is then used to |
| # 3) create one <module>.mod.c file pr. module |
| # 4) create one Module.symvers file with CRC for all exported symbols |
| # 5) compile all <module>.mod.c files |
| # 6) final link of the module to a <module.ko> file |
| |
| # Step 3 is used to place certain information in the module's ELF |
| # section, including information such as: |
| # Version magic (see include/vermagic.h for full details) |
| # - Kernel release |
| # - SMP is CONFIG_SMP |
| # - PREEMPT is CONFIG_PREEMPT |
| # - GCC Version |
| # Module info |
| # - Module version (MODULE_VERSION) |
| # - Module alias'es (MODULE_ALIAS) |
| # - Module license (MODULE_LICENSE) |
| # - See include/linux/module.h for more details |
| |
| # Step 4 is solely used to allow module versioning in external modules, |
| # where the CRC of each module is retrieved from the Module.symers file. |
| |
| PHONY := _modpost |
| _modpost: __modpost |
| |
| include include/config/auto.conf |
| include scripts/Kbuild.include |
| include scripts/Makefile.lib |
| |
| kernelsymfile := $(objtree)/Module.symvers |
| modulesymfile := $(KBUILD_EXTMOD)/Module.symvers |
| |
| # Step 1), find all modules listed in $(MODVERDIR)/ |
| __modules := $(sort $(shell grep -h '\.ko' /dev/null $(wildcard $(MODVERDIR)/*.mod))) |
| modules := $(patsubst %.o,%.ko, $(wildcard $(__modules:.ko=.o))) |
| |
| _modpost: $(modules) |
| |
| |
| # Step 2), invoke modpost |
| # Includes step 3,4 |
| quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules |
| cmd_modpost = scripts/mod/modpost \ |
| $(if $(CONFIG_MODVERSIONS),-m) \ |
| $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a,) \ |
| $(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile) \ |
| $(if $(KBUILD_EXTMOD),-I $(modulesymfile)) \ |
| $(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \ |
| $(wildcard vmlinux) $(filter-out FORCE,$^) |
| |
| PHONY += __modpost |
| __modpost: $(modules:.ko=.o) FORCE |
| $(call cmd,modpost) |
| |
| quiet_cmd_kernel-mod = MODPOST $@ |
| cmd_kernel-mod = $(cmd_modpost) |
| |
| vmlinux: FORCE |
| $(call cmd,kernel-mod) |
| |
| # Declare generated files as targets for modpost |
| $(symverfile): __modpost ; |
| $(modules:.ko=.mod.c): __modpost ; |
| |
| |
| # Step 5), compile all *.mod.c files |
| |
| # modname is set to make c_flags define KBUILD_MODNAME |
| modname = $(notdir $(@:.mod.o=)) |
| |
| quiet_cmd_cc_o_c = CC $@ |
| cmd_cc_o_c = $(CC) $(c_flags) $(CFLAGS_MODULE) \ |
| -c -o $@ $< |
| |
| $(modules:.ko=.mod.o): %.mod.o: %.mod.c FORCE |
| $(call if_changed_dep,cc_o_c) |
| |
| targets += $(modules:.ko=.mod.o) |
| |
| # Step 6), final link of the modules |
| quiet_cmd_ld_ko_o = LD [M] $@ |
| cmd_ld_ko_o = $(LD) $(LDFLAGS) $(LDFLAGS_MODULE) -o $@ \ |
| $(filter-out FORCE,$^) |
| |
| $(modules): %.ko :%.o %.mod.o FORCE |
| $(call if_changed,ld_ko_o) |
| |
| targets += $(modules) |
| |
| |
| # Add FORCE to the prequisites of a target to force it to be always rebuilt. |
| # --------------------------------------------------------------------------- |
| |
| PHONY += FORCE |
| |
| FORCE: |
| |
| # Read all saved command lines and dependencies for the $(targets) we |
| # may be building above, using $(if_changed{,_dep}). As an |
| # optimization, we don't need to read them if the target does not |
| # exist, we will rebuild anyway in that case. |
| |
| targets := $(wildcard $(sort $(targets))) |
| cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) |
| |
| ifneq ($(cmd_files),) |
| include $(cmd_files) |
| endif |
| |
| |
| # Declare the contents of the .PHONY variable as phony. We keep that |
| # information in a variable se we can use it in if_changed and friends. |
| |
| .PHONY: $(PHONY) |