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187 lines
6.7 KiB
187 lines
6.7 KiB
# SPDX-License-Identifier: GPL-2.0 |
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# =========================================================================== |
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# Module versions |
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# =========================================================================== |
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# |
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# Stage one of module building created the following: |
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# a) The individual .o files used for the module |
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# b) A <module>.o file which is the .o files above linked together |
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# c) A <module>.mod file in $(MODVERDIR)/, listing the name of the |
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# the preliminary <module>.o file, plus all .o files |
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# Stage 2 is handled by this file and does the following |
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# 1) Find all modules from the files listed in $(MODVERDIR)/ |
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# 2) modpost is then used to |
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# 3) create one <module>.mod.c file pr. module |
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# 4) create one Module.symvers file with CRC for all exported symbols |
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# 5) compile all <module>.mod.c files |
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# 6) final link of the module to a <module.ko> file |
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# Step 3 is used to place certain information in the module's ELF |
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# section, including information such as: |
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# Version magic (see include/linux/vermagic.h for full details) |
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# - Kernel release |
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# - SMP is CONFIG_SMP |
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# - PREEMPT is CONFIG_PREEMPT |
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# - GCC Version |
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# Module info |
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# - Module version (MODULE_VERSION) |
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# - Module alias'es (MODULE_ALIAS) |
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# - Module license (MODULE_LICENSE) |
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# - See include/linux/module.h for more details |
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# Step 4 is solely used to allow module versioning in external modules, |
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# where the CRC of each module is retrieved from the Module.symvers file. |
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# KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined |
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# symbols in the final module linking stage |
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# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. |
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# This is solely useful to speed up test compiles |
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PHONY := _modpost |
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_modpost: __modpost |
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include include/config/auto.conf |
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include scripts/Kbuild.include |
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# When building external modules load the Kbuild file to retrieve EXTRA_SYMBOLS info |
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ifneq ($(KBUILD_EXTMOD),) |
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# set src + obj - they may be used when building the .mod.c file |
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obj := $(KBUILD_EXTMOD) |
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src := $(obj) |
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# Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS |
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include $(if $(wildcard $(KBUILD_EXTMOD)/Kbuild), \ |
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$(KBUILD_EXTMOD)/Kbuild, $(KBUILD_EXTMOD)/Makefile) |
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endif |
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include scripts/Makefile.lib |
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kernelsymfile := $(objtree)/Module.symvers |
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modulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers |
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# Step 1), find all modules listed in $(MODVERDIR)/ |
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MODLISTCMD := find $(MODVERDIR) -name '*.mod' | xargs -r grep -h '\.ko$$' | sort -u |
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__modules := $(shell $(MODLISTCMD)) |
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modules := $(patsubst %.o,%.ko, $(wildcard $(__modules:.ko=.o))) |
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# Stop after building .o files if NOFINAL is set. Makes compile tests quicker |
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_modpost: $(if $(KBUILD_MODPOST_NOFINAL), $(modules:.ko:.o),$(modules)) |
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# Step 2), invoke modpost |
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# Includes step 3,4 |
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modpost = scripts/mod/modpost \ |
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$(if $(CONFIG_MODVERSIONS),-m) \ |
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$(if $(CONFIG_MODULE_SRCVERSION_ALL),-a,) \ |
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$(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile) \ |
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$(if $(KBUILD_EXTMOD),-I $(modulesymfile)) \ |
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$(if $(KBUILD_EXTMOD),$(addprefix -e ,$(KBUILD_EXTRA_SYMBOLS))) \ |
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$(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \ |
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$(if $(CONFIG_DEBUG_SECTION_MISMATCH),,-S) \ |
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$(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \ |
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$(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),$(if $(KBUILD_MODPOST_FAIL_ON_WARNINGS),,-w)) |
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MODPOST_OPT=$(subst -i,-n,$(filter -i,$(MAKEFLAGS))) |
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# If CONFIG_LTO_CLANG is enabled, .o files are either LLVM IR, or empty, so we |
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# need to link them into actual objects before passing them to modpost |
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modpost-ext = $(if $(CONFIG_LTO_CLANG),.lto,) |
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ifdef CONFIG_LTO_CLANG |
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quiet_cmd_cc_lto_link_modules = LD [M] $@ |
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cmd_cc_lto_link_modules = \ |
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$(LD) $(ld_flags) -r -o $(@) \ |
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$(shell [ -s $(@:$(modpost-ext).o=.o.symversions) ] && \ |
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echo -T $(@:$(modpost-ext).o=.o.symversions)) \ |
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--whole-archive $(filter-out FORCE,$^) |
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$(modules:.ko=$(modpost-ext).o): %$(modpost-ext).o: %.o FORCE |
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$(call if_changed,cc_lto_link_modules) |
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endif |
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# We can go over command line length here, so be careful. |
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quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules |
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cmd_modpost = $(MODLISTCMD) | sed 's/\.ko$$/$(modpost-ext)\.o/' | $(modpost) $(MODPOST_OPT) -s -T - |
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PHONY += __modpost |
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__modpost: $(modules:.ko=$(modpost-ext).o) FORCE |
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$(call cmd,modpost) $(wildcard vmlinux) |
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quiet_cmd_kernel-mod = MODPOST $@ |
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cmd_kernel-mod = $(modpost) $@ |
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vmlinux.o: FORCE |
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$(call cmd,kernel-mod) |
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# Declare generated files as targets for modpost |
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$(modules:.ko=$(modpost-ext).mod.c): __modpost ; |
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# Step 5), compile all *.mod.c files |
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# modname is set to make c_flags define KBUILD_MODNAME |
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modname = $(notdir $(@:.mod.o=)) |
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quiet_cmd_cc_o_c = CC $@ |
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cmd_cc_o_c = $(CC) $(c_flags) $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE) \ |
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-c -o $@ $< |
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$(modules:.ko=.mod.o): %.mod.o: %$(modpost-ext).mod.c FORCE |
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$(call if_changed_dep,cc_o_c) |
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targets += $(modules:.ko=$(modpost-ext).mod.o) |
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ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) |
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# Step 6), final link of the modules with optional arch pass after final link |
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quiet_cmd_ld_ko_o = LD [M] $@ |
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ifdef CONFIG_LTO_CLANG |
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cmd_ld_ko_o = \ |
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$(LD) -r $(LDFLAGS) \ |
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$(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \ |
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$(shell [ -s $(@:.ko=.o.symversions) ] && \ |
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echo -T $(@:.ko=.o.symversions)) \ |
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-o $@ --whole-archive \ |
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$(filter-out FORCE,$(^:$(modpost-ext).o=.o)) |
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ifdef CONFIG_FTRACE_MCOUNT_RECORD |
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cmd_ld_ko_o += ; $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) $@ |
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endif |
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else |
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cmd_ld_ko_o = \ |
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$(LD) -r $(LDFLAGS) \ |
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$(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \ |
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-o $@ $(filter-out FORCE,$^) ; \ |
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$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) |
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endif |
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$(modules): %.ko: %$(modpost-ext).o %.mod.o FORCE |
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+$(call if_changed,ld_ko_o) |
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targets += $(modules) |
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# Add FORCE to the prequisites of a target to force it to be always rebuilt. |
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# --------------------------------------------------------------------------- |
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PHONY += FORCE |
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FORCE: |
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# Read all saved command lines and dependencies for the $(targets) we |
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# may be building above, using $(if_changed{,_dep}). As an |
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# optimization, we don't need to read them if the target does not |
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# exist, we will rebuild anyway in that case. |
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targets := $(wildcard $(sort $(targets))) |
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cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) |
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ifneq ($(cmd_files),) |
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include $(cmd_files) |
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endif |
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# Declare the contents of the .PHONY variable as phony. We keep that |
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# information in a variable se we can use it in if_changed and friends. |
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.PHONY: $(PHONY)
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