1 # SPDX-License-Identifier: GPL-2.0 2 # =========================================================================== 3 # Module versions 4 # =========================================================================== 5 # 6 # Stage one of module building created the following: 7 # a) The individual .o files used for the module 8 # b) A <module>.o file which is the .o files above linked together 9 # c) A <module>.mod file, listing the name of the preliminary <module>.o file, 10 # plus all .o files 11 # d) modules.order, which lists all the modules 12 13 # Stage 2 is handled by this file and does the following 14 # 1) Find all modules listed in modules.order 15 # 2) modpost is then used to 16 # 3) create one <module>.mod.c file per module 17 # 4) create one Module.symvers file with CRC for all exported symbols 18 19 # Step 3 is used to place certain information in the module's ELF 20 # section, including information such as: 21 # Version magic (see include/linux/vermagic.h for full details) 22 # - Kernel release 23 # - SMP is CONFIG_SMP 24 # - PREEMPT is CONFIG_PREEMPT[_RT] 25 # - GCC Version 26 # Module info 27 # - Module version (MODULE_VERSION) 28 # - Module alias'es (MODULE_ALIAS) 29 # - Module license (MODULE_LICENSE) 30 # - See include/linux/module.h for more details 31 32 # Step 4 is solely used to allow module versioning in external modules, 33 # where the CRC of each module is retrieved from the Module.symvers file. 34 35 PHONY := __modpost 36 __modpost: 37 38 include include/config/auto.conf 39 include $(srctree)/scripts/Kbuild.include 40 41 MODPOST = scripts/mod/modpost 42 43 modpost-args = \ 44 $(if $(CONFIG_MODULES),-M) \ 45 $(if $(CONFIG_MODVERSIONS),-m) \ 46 $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a) \ 47 $(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \ 48 $(if $(KBUILD_MODPOST_WARN),-w) \ 49 $(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS)) \ 50 $(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N) \ 51 $(if $(findstring 1, $(KBUILD_EXTRA_WARN)),-W) \ 52 -o $@ 53 54 modpost-deps := $(MODPOST) 55 56 # 'make -i -k' ignores compile errors, and builds as many modules as possible. 57 ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),) 58 modpost-args += -n 59 endif 60 61 # Read out modules.order to pass in modpost. 62 # Otherwise, allmodconfig would fail with "Argument list too long". 63 ifdef KBUILD_MODULES 64 modpost-args += -T $(MODORDER) 65 modpost-deps += $(MODORDER) 66 endif 67 68 ifeq ($(KBUILD_EXTMOD),) 69 70 # Generate the list of in-tree objects in vmlinux 71 # --------------------------------------------------------------------------- 72 73 # This is used to retrieve symbol versions generated by genksyms. 74 ifdef CONFIG_MODVERSIONS 75 vmlinux.symvers Module.symvers: .vmlinux.objs 76 endif 77 78 # Ignore libgcc.a 79 # Some architectures do '$(CC) --print-libgcc-file-name' to borrow libgcc.a 80 # from the toolchain, but there is no EXPORT_SYMBOL in it. 81 82 quiet_cmd_vmlinux_objs = GEN $@ 83 cmd_vmlinux_objs = \ 84 for f in $(real-prereqs); do \ 85 case $${f} in \ 86 *libgcc.a) ;; \ 87 *) $(AR) t $${f} ;; \ 88 esac \ 89 done > $@ 90 91 targets += .vmlinux.objs 92 .vmlinux.objs: vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE 93 $(call if_changed,vmlinux_objs) 94 95 ifdef CONFIG_TRIM_UNUSED_KSYMS 96 ksym-wl := $(CONFIG_UNUSED_KSYMS_WHITELIST) 97 ksym-wl := $(if $(filter-out /%, $(ksym-wl)),$(if $(wildcard $(ksym-wl)),,$(srctree)/))$(ksym-wl) 98 modpost-args += -t $(addprefix -u , $(ksym-wl)) 99 modpost-deps += $(ksym-wl) 100 endif 101 102 ifeq ($(wildcard vmlinux.o),) 103 missing-input := vmlinux.o 104 output-symdump := modules-only.symvers 105 else 106 modpost-args += vmlinux.o 107 modpost-deps += vmlinux.o 108 output-symdump := $(if $(KBUILD_MODULES), Module.symvers, vmlinux.symvers) 109 endif 110 111 else 112 113 # set src + obj - they may be used in the modules's Makefile 114 obj := $(KBUILD_EXTMOD) 115 src := $(if $(VPATH),$(VPATH)/)$(obj) 116 117 # Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS 118 include $(kbuild-file) 119 120 output-symdump := $(KBUILD_EXTMOD)/Module.symvers 121 122 ifeq ($(wildcard Module.symvers),) 123 missing-input := Module.symvers 124 else 125 modpost-args += -i Module.symvers 126 modpost-deps += Module.symvers 127 endif 128 129 modpost-args += -e $(addprefix -i , $(KBUILD_EXTRA_SYMBOLS)) 130 131 endif # ($(KBUILD_EXTMOD),) 132 133 quiet_cmd_modpost = MODPOST $@ 134 cmd_modpost = \ 135 $(if $(missing-input), \ 136 echo >&2 "WARNING: $(missing-input) is missing."; \ 137 echo >&2 " Modules may not have dependencies or modversions."; \ 138 echo >&2 " You may get many unresolved symbol errors."; \ 139 echo >&2 " You can set KBUILD_MODPOST_WARN=1 to turn errors into warning"; \ 140 echo >&2 " if you want to proceed at your own risk.";) \ 141 $(MODPOST) $(modpost-args) 142 143 targets += $(output-symdump) 144 $(output-symdump): $(modpost-deps) FORCE 145 $(call if_changed,modpost) 146 147 __modpost: $(output-symdump) 148 PHONY += FORCE 149 FORCE: 150 151 existing-targets := $(wildcard $(sort $(targets))) 152 153 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 154 155 .PHONY: $(PHONY)
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