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136 lines
4.4 KiB
136 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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PHONY := __modpost |
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__modpost: |
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include include/config/auto.conf |
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include $(srctree)/scripts/Kbuild.include |
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modpost-args = \ |
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$(if $(CONFIG_MODVERSIONS),-m) \ |
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$(if $(CONFIG_MODULE_SRCVERSION_ALL),-a) \ |
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$(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \ |
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$(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS)) \ |
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$(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N) \ |
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-o $@ |
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# 'make -i -k' ignores compile errors, and builds as many modules as possible. |
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ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),) |
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modpost-args += -n |
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endif |
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ifeq ($(KBUILD_EXTMOD),) |
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# Generate the list of in-tree objects in vmlinux |
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# --------------------------------------------------------------------------- |
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# This is used to retrieve symbol versions generated by genksyms. |
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ifdef CONFIG_MODVERSIONS |
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vmlinux.symvers Module.symvers: .vmlinux.objs |
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endif |
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# Ignore libgcc.a |
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# Some architectures do '$(CC) --print-libgcc-file-name' to borrow libgcc.a |
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# from the toolchain, but there is no EXPORT_SYMBOL in it. |
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quiet_cmd_vmlinux_objs = GEN $@ |
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cmd_vmlinux_objs = \ |
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for f in $(real-prereqs); do \ |
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case $${f} in \ |
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*libgcc.a) ;; \ |
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*) $(AR) t $${f} ;; \ |
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esac \ |
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done > $@ |
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targets += .vmlinux.objs |
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.vmlinux.objs: vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE |
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$(call if_changed,vmlinux_objs) |
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vmlinux.o-if-present := $(wildcard vmlinux.o) |
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output-symdump := vmlinux.symvers |
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ifdef KBUILD_MODULES |
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output-symdump := $(if $(vmlinux.o-if-present), Module.symvers, modules-only.symvers) |
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missing-input := $(filter-out $(vmlinux.o-if-present),vmlinux.o) |
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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 $(or $(wildcard $(src)/Kbuild), $(src)/Makefile) |
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module.symvers-if-present := $(wildcard Module.symvers) |
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output-symdump := $(KBUILD_EXTMOD)/Module.symvers |
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missing-input := $(filter-out $(module.symvers-if-present), Module.symvers) |
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modpost-args += -e $(addprefix -i ,$(module.symvers-if-present) $(KBUILD_EXTRA_SYMBOLS)) |
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endif # ($(KBUILD_EXTMOD),) |
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ifneq ($(KBUILD_MODPOST_WARN)$(missing-input),) |
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modpost-args += -w |
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endif |
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modorder-if-needed := $(if $(KBUILD_MODULES), $(MODORDER)) |
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MODPOST = scripts/mod/modpost |
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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 $@ |
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cmd_modpost = \ |
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$(if $(missing-input), \ |
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echo >&2 "WARNING: $(missing-input) 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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sed 's/ko$$/o/' $(or $(modorder-if-needed), /dev/null) | $(MODPOST) $(modpost-args) -T - $(vmlinux.o-if-present) |
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targets += $(output-symdump) |
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$(output-symdump): $(modorder-if-needed) $(vmlinux.o-if-present) $(module.symvers-if-present) $(MODPOST) FORCE |
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$(call if_changed,modpost) |
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__modpost: $(output-symdump) |
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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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.PHONY: $(PHONY)
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