123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187 |
- # SPDX-License-Identifier: GPL-2.0
- # ===========================================================================
- # 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, listing the name of the preliminary <module>.o file,
- # plus all .o files
- # d) modules.order, which lists all the modules
- # Stage 2 is handled by this file and does the following
- # 1) Find all modules listed in modules.order
- # 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
- # Step 3 is used to place certain information in the module's ELF
- # section, including information such as:
- # Version magic (see include/linux/vermagic.h for full details)
- # - Kernel release
- # - SMP is CONFIG_SMP
- # - PREEMPT is CONFIG_PREEMPT[_RT]
- # - 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.symvers file.
- # KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined
- # symbols in the final module linking stage
- # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
- # This is solely useful to speed up test compiles
- PHONY := __modpost
- __modpost:
- include include/config/auto.conf
- include scripts/Kbuild.include
- # for ld_flags
- include scripts/Makefile.lib
- mixed-build-prefix = $(if $(KBUILD_MIXED_TREE),$(KBUILD_MIXED_TREE)/)
- MODPOST = scripts/mod/modpost \
- $(if $(CONFIG_MODVERSIONS),-m) \
- $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a) \
- $(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \
- $(if $(KBUILD_MODPOST_WARN),-w) \
- -o $@
- ifdef MODPOST_VMLINUX
- quiet_cmd_modpost = MODPOST $@
- cmd_modpost = $(MODPOST) $<
- vmlinux.symvers: vmlinux.o
- $(call cmd,modpost)
- __modpost: vmlinux.symvers
- else
- ifeq ($(KBUILD_EXTMOD),)
- input-symdump := $(mixed-build-prefix)vmlinux.symvers
- output-symdump := modules-only.symvers
- module_srcpath := $(srctree)
- quiet_cmd_cat = GEN $@
- cmd_cat = cat $(real-prereqs) > $@
- ifneq ($(wildcard $(mixed-build-prefix)vmlinux.symvers),)
- __modpost: Module.symvers
- Module.symvers: $(mixed-build-prefix)vmlinux.symvers modules-only.symvers FORCE
- $(call if_changed,cat)
- targets += Module.symvers
- endif
- else
- # set src + obj - they may be used in the modules's Makefile
- obj := $(KBUILD_EXTMOD)
- src := $(obj)
- # Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS
- include $(if $(wildcard $(KBUILD_EXTMOD)/Kbuild), \
- $(KBUILD_EXTMOD)/Kbuild, $(KBUILD_EXTMOD)/Makefile)
- # modpost option for external modules
- MODPOST += -e
- input-symdump := Module.symvers $(KBUILD_EXTRA_SYMBOLS)
- output-symdump := $(KBUILD_EXTMOD)/Module.symvers
- # Get the external module's source path. KBUILD_EXTMOD could either be an
- # absolute path or relative path from $(srctree). This makes sure that we
- # aren't using a relative path from a separate working directory (O= or
- # KBUILD_OUTPUT) since that may not be the actual module's SCM project path. So
- # check the path relative to $(srctree) first.
- ifneq ($(realpath $(srctree)/$(KBUILD_EXTMOD) 2>/dev/null),)
- module_srcpath := $(srctree)/$(KBUILD_EXTMOD)
- else
- module_srcpath := $(KBUILD_EXTMOD)
- endif
- endif
- ifeq ($(CONFIG_MODULE_SCMVERSION),y)
- # Get the SCM version of the module. `sed` verifies setlocalversion returns
- # a proper revision based on the SCM type, e.g. git, mercurial, or svn.
- module_scmversion := $(shell $(srctree)/scripts/setlocalversion $(module_srcpath) | \
- sed -n 's/.*-\(\(g\|hg\)[a-fA-F0-9]\+\(-dirty\)\?\|svn[0-9]\+\).*/\1/p')
- ifneq ($(module_scmversion),)
- MODPOST += -v $(module_scmversion)
- endif
- endif
- # modpost options for modules (both in-kernel and external)
- MODPOST += \
- $(addprefix -i ,$(wildcard $(input-symdump))) \
- $(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS)) \
- $(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N)
- # 'make -i -k' ignores compile errors, and builds as many modules as possible.
- ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),)
- MODPOST += -n
- endif
- # Clear VPATH to not search for *.symvers in $(srctree). Check only $(objtree).
- VPATH :=
- $(input-symdump):
- @echo >&2 'WARNING: Symbol version dump "$@" is missing.'
- @echo >&2 ' Modules may not have dependencies or modversions.'
- ifdef CONFIG_LTO_CLANG
- # With CONFIG_LTO_CLANG, .o files might be LLVM bitcode, so we need to run
- # LTO to compile them into native code before running modpost
- prelink-ext := .lto
- quiet_cmd_cc_lto_link_modules = LTO [M] $@
- cmd_cc_lto_link_modules = \
- $(LD) $(ld_flags) -r -o $@ \
- $(shell [ -s $(@:.lto.o=.o.symversions) ] && \
- echo -T $(@:.lto.o=.o.symversions)) \
- --whole-archive $^
- %.lto.o: %.o
- $(call if_changed,cc_lto_link_modules)
- endif
- modules := $(sort $(shell cat $(MODORDER)))
- # Read out modules.order to pass in modpost.
- # Otherwise, allmodconfig would fail with "Argument list too long".
- quiet_cmd_modpost = MODPOST $@
- cmd_modpost = sed 's/\.ko$$/$(prelink-ext)\.o/' $< | $(MODPOST) -T -
- $(output-symdump): $(MODORDER) $(input-symdump) $(modules:.ko=$(prelink-ext).o) FORCE
- $(call if_changed,modpost)
- targets += $(output-symdump)
- __modpost: $(output-symdump)
- ifneq ($(KBUILD_MODPOST_NOFINAL),1)
- $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
- endif
- PHONY += FORCE
- FORCE:
- existing-targets := $(wildcard $(sort $(targets)))
- -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
- endif
- .PHONY: $(PHONY)
|