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152 lines
4.4 KiB
152 lines
4.4 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, listing the name of the preliminary <module>.o file, |
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# plus all .o files |
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# d) modules.order, which lists all the modules |
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# Stage 2 is handled by this file and does the following |
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# 1) Find all modules listed in modules.order |
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# 2) modpost is then used to |
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# 3) create one <module>.mod.c file per module |
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# 4) create one Module.symvers file with CRC for all exported symbols |
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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[_RT] |
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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_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: |
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include include/config/auto.conf |
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include $(srctree)/scripts/Kbuild.include |
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# for mod-prelink-ext |
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include $(srctree)/scripts/Makefile.lib |
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MODPOST = scripts/mod/modpost \ |
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$(if $(CONFIG_MODVERSIONS),-m) \ |
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$(if $(CONFIG_MODULE_SRCVERSION_ALL),-a) \ |
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$(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \ |
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-o $@ |
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ifdef MODPOST_VMLINUX |
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quiet_cmd_modpost = MODPOST $@ |
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cmd_modpost = $(MODPOST) $< |
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vmlinux.symvers: vmlinux.o |
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$(call cmd,modpost) |
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__modpost: vmlinux.symvers |
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else |
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ifeq ($(KBUILD_EXTMOD),) |
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input-symdump := vmlinux.symvers |
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output-symdump := modules-only.symvers |
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quiet_cmd_cat = GEN $@ |
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cmd_cat = cat $(real-prereqs) > $@ |
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ifneq ($(wildcard vmlinux.symvers),) |
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__modpost: Module.symvers |
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Module.symvers: vmlinux.symvers modules-only.symvers FORCE |
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$(call if_changed,cat) |
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targets += Module.symvers |
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endif |
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else |
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# set src + obj - they may be used in the modules's Makefile |
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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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# modpost option for external modules |
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MODPOST += -e |
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input-symdump := Module.symvers $(KBUILD_EXTRA_SYMBOLS) |
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output-symdump := $(KBUILD_EXTMOD)/Module.symvers |
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endif |
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existing-input-symdump := $(wildcard $(input-symdump)) |
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# modpost options for modules (both in-kernel and external) |
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MODPOST += \ |
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$(addprefix -i ,$(existing-input-symdump)) \ |
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$(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS)) \ |
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$(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N) |
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# 'make -i -k' ignores compile errors, and builds as many modules as possible. |
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ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),) |
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MODPOST += -n |
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endif |
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# Clear VPATH to not search for *.symvers in $(srctree). Check only $(objtree). |
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VPATH := |
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$(input-symdump): |
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@echo >&2 'WARNING: Symbol version dump "$@" is missing.' |
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@echo >&2 ' Modules may not have dependencies or modversions.' |
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@echo >&2 ' You may get many unresolved symbol warnings.' |
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modules := $(sort $(shell cat $(MODORDER))) |
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# KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined symbols |
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ifneq ($(KBUILD_MODPOST_WARN)$(filter-out $(existing-input-symdump), $(input-symdump)),) |
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MODPOST += -w |
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endif |
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# Read out modules.order to pass in modpost. |
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# Otherwise, allmodconfig would fail with "Argument list too long". |
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quiet_cmd_modpost = MODPOST $@ |
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cmd_modpost = sed 's/\.ko$$/$(mod-prelink-ext)\.o/' $< | $(MODPOST) -T - |
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$(output-symdump): $(MODORDER) $(input-symdump) $(modules:.ko=$(mod-prelink-ext).o) FORCE |
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$(call if_changed,modpost) |
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targets += $(output-symdump) |
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__modpost: $(output-symdump) |
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ifneq ($(KBUILD_MODPOST_NOFINAL),1) |
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$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal |
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endif |
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PHONY += FORCE |
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FORCE: |
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existing-targets := $(wildcard $(sort $(targets))) |
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-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) |
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endif |
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.PHONY: $(PHONY)
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