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