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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 | # 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 per 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. PHONY := __modpost __modpost: include include/config/auto.conf include $(srctree)/scripts/Kbuild.include modpost-args = \ $(if $(CONFIG_MODVERSIONS),-m) \ $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a) \ $(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \ $(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS)) \ $(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N) \ $(if $(findstring 1, $(KBUILD_EXTRA_WARN)),-W) \ -o $@ # 'make -i -k' ignores compile errors, and builds as many modules as possible. ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),) modpost-args += -n endif ifeq ($(KBUILD_EXTMOD),) # Generate the list of in-tree objects in vmlinux # --------------------------------------------------------------------------- # This is used to retrieve symbol versions generated by genksyms. ifdef CONFIG_MODVERSIONS vmlinux.symvers Module.symvers: .vmlinux.objs endif # Ignore libgcc.a # Some architectures do '$(CC) --print-libgcc-file-name' to borrow libgcc.a # from the toolchain, but there is no EXPORT_SYMBOL in it. quiet_cmd_vmlinux_objs = GEN $@ cmd_vmlinux_objs = \ for f in $(real-prereqs); do \ case $${f} in \ *libgcc.a) ;; \ *) $(AR) t $${f} ;; \ esac \ done > $@ targets += .vmlinux.objs .vmlinux.objs: vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE $(call if_changed,vmlinux_objs) vmlinux.o-if-present := $(wildcard vmlinux.o) output-symdump := vmlinux.symvers ifdef KBUILD_MODULES output-symdump := $(if $(vmlinux.o-if-present), Module.symvers, modules-only.symvers) missing-input := $(filter-out $(vmlinux.o-if-present),vmlinux.o) 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 $(or $(wildcard $(src)/Kbuild), $(src)/Makefile) module.symvers-if-present := $(wildcard Module.symvers) output-symdump := $(KBUILD_EXTMOD)/Module.symvers missing-input := $(filter-out $(module.symvers-if-present), Module.symvers) modpost-args += -e $(addprefix -i ,$(module.symvers-if-present) $(KBUILD_EXTRA_SYMBOLS)) endif # ($(KBUILD_EXTMOD),) ifneq ($(KBUILD_MODPOST_WARN)$(missing-input),) modpost-args += -w endif modorder-if-needed := $(if $(KBUILD_MODULES), $(MODORDER)) MODPOST = scripts/mod/modpost # Read out modules.order to pass in modpost. # Otherwise, allmodconfig would fail with "Argument list too long". quiet_cmd_modpost = MODPOST $@ cmd_modpost = \ $(if $(missing-input), \ echo >&2 "WARNING: $(missing-input) is missing."; \ echo >&2 " Modules may not have dependencies or modversions."; \ echo >&2 " You may get many unresolved symbol warnings.";) \ sed 's/ko$$/o/' $(or $(modorder-if-needed), /dev/null) | $(MODPOST) $(modpost-args) -T - $(vmlinux.o-if-present) targets += $(output-symdump) $(output-symdump): $(modorder-if-needed) $(vmlinux.o-if-present) $(module.symvers-if-present) $(MODPOST) FORCE $(call if_changed,modpost) __modpost: $(output-symdump) PHONY += FORCE FORCE: existing-targets := $(wildcard $(sort $(targets))) -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) .PHONY: $(PHONY) |