197 lines
6.6 KiB
Makefile
Executable File
197 lines
6.6 KiB
Makefile
Executable File
# 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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mixed-build-prefix = $(if $(KBUILD_MIXED_TREE),$(KBUILD_MIXED_TREE)/)
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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 ($(CONFIG_MODULE_SCMVERSION),y)
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ifeq ($(KBUILD_EXTMOD),)
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module_srcpath := $(srctree)
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else
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# Get the external module's source path. KBUILD_EXTMOD could either be an
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# absolute path or relative path from $(srctree). This makes sure that we
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# aren't using a relative path from a separate working directory (O= or
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# KBUILD_OUTPUT) since that may not be the actual module's SCM project path. So
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# check the path relative to $(srctree) first.
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ifneq ($(realpath $(srctree)/$(KBUILD_EXTMOD) 2>/dev/null),)
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module_srcpath := $(srctree)/$(KBUILD_EXTMOD)
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else
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module_srcpath := $(KBUILD_EXTMOD)
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endif
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endif
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# Get the SCM version of the module. Sed verifies setlocalversion returns
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# a proper revision based on the SCM type, e.g. git, mercurial, or svn.
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# Note: relative M= paths are not supported when building the kernel out of the
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# srctree since setlocalversion won't be able to find the module srctree.
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module_scmversion := $(shell $(srctree)/scripts/setlocalversion $(module_srcpath) | \
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sed -n 's/.*-\(\(g\|hg\)[a-fA-F0-9]\+\(-dirty\)\?\|svn[0-9]\+\).*/\1/p')
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ifneq ($(module_scmversion),)
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modpost-args += -v $(module_scmversion)
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endif
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endif
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ifeq ($(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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ifndef KBUILD_MIXED_TREE
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vmlinux.symvers Module.symvers: .vmlinux.objs
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endif
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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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quiet_cmd_vmlinux_symvers = GEN $@
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cmd_vmlinux_symvers = grep "\<vmlinux\s\+EXPORT" $< > $@
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quiet_cmd_cat_symvers = GEN $@
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cmd_cat_symvers = cat $(real-prereqs) > $@
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ifndef KBUILD_MIXED_TREE
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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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endif
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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 $(vmlinux.o-if-present),vmlinux.o)
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targets += vmlinux.symvers
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vmlinux.symvers: Module.symvers FORCE
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$(call if_changed,vmlinux_symvers)
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__modpost: $(if $(vmlinux.o-if-present),vmlinux.symvers,)
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endif
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# Overwrite values for mixed building (overwritting makes merges easier)
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ifdef KBUILD_MIXED_TREE
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targets += Module.symvers
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Module.symvers: $(mixed-build-prefix)vmlinux.symvers modules-only.symvers FORCE
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$(call if_changed,cat_symvers)
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__modpost: Module.symvers
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vmlinux.o-if-present :=
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vmlinux.symvers-if-present := $(wildcard $(mixed-build-prefix)vmlinux.symvers)
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modpost-args += $(addprefix -i ,$(vmlinux.symvers-if-present))
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output-symdump := modules-only.symvers
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missing-input := $(filter-out $(vmlinux.symvers-if-present),$(mixed-build-prefix)vmlinux.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 $(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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