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b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
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 | |
c30fe7f7 | 8 | # b) A <module>.o file which is the .o files above linked together |
b7dca6dd MY |
9 | # c) A <module>.mod file, listing the name of the preliminary <module>.o file, |
10 | # plus all .o files | |
ff9b45c5 | 11 | # d) modules.order, which lists all the modules |
1da177e4 LT |
12 | |
13 | # Stage 2 is handled by this file and does the following | |
ff9b45c5 | 14 | # 1) Find all modules listed in modules.order |
1da177e4 | 15 | # 2) modpost is then used to |
7c801446 | 16 | # 3) create one <module>.mod.c file per module |
1da177e4 | 17 | # 4) create one Module.symvers file with CRC for all exported symbols |
1da177e4 LT |
18 | |
19 | # Step 3 is used to place certain information in the module's ELF | |
20 | # section, including information such as: | |
163d3fe6 | 21 | # Version magic (see include/linux/vermagic.h for full details) |
1da177e4 LT |
22 | # - Kernel release |
23 | # - SMP is CONFIG_SMP | |
4b950bb9 | 24 | # - PREEMPT is CONFIG_PREEMPT[_RT] |
1da177e4 LT |
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, | |
4696e295 | 33 | # where the CRC of each module is retrieved from the Module.symvers file. |
1da177e4 | 34 | |
a721588d MY |
35 | PHONY := __modpost |
36 | __modpost: | |
1da177e4 | 37 | |
c955ccaf | 38 | include include/config/auto.conf |
3204a7fb | 39 | include $(srctree)/scripts/Kbuild.include |
0d96fb20 | 40 | |
3d57e1b7 MY |
41 | MODPOST = scripts/mod/modpost |
42 | ||
42593738 | 43 | modpost-args = \ |
481461f5 | 44 | $(if $(CONFIG_MODULES),-M) \ |
54b77847 JY |
45 | $(if $(CONFIG_MODVERSIONS),-m) \ |
46 | $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a) \ | |
54b77847 | 47 | $(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \ |
735aec59 | 48 | $(if $(KBUILD_MODPOST_WARN),-w) \ |
f73edc89 MY |
49 | $(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS)) \ |
50 | $(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N) \ | |
20ff3685 | 51 | $(if $(findstring 1, $(KBUILD_EXTRA_WARN)),-W) \ |
bcfedae7 | 52 | -o $@ |
a721588d | 53 | |
3d57e1b7 MY |
54 | modpost-deps := $(MODPOST) |
55 | ||
f73edc89 MY |
56 | # 'make -i -k' ignores compile errors, and builds as many modules as possible. |
57 | ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),) | |
42593738 | 58 | modpost-args += -n |
f73edc89 | 59 | endif |
a721588d | 60 | |
63ffe00d SH |
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 += $(MODORDER) | |
66 | endif | |
67 | ||
f73edc89 | 68 | ifeq ($(KBUILD_EXTMOD),) |
bcfedae7 | 69 | |
26ef40de MY |
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 | |
f73edc89 | 75 | vmlinux.symvers Module.symvers: .vmlinux.objs |
26ef40de MY |
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 $${f} in \ | |
86 | *libgcc.a) ;; \ | |
32164845 | 87 | *) $(AR) t $${f} ;; \ |
26ef40de MY |
88 | esac \ |
89 | done > $@ | |
90 | ||
91 | targets += .vmlinux.objs | |
32164845 | 92 | .vmlinux.objs: vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE |
26ef40de MY |
93 | $(call if_changed,vmlinux_objs) |
94 | ||
5e9e95cc MY |
95 | ifdef CONFIG_TRIM_UNUSED_KSYMS |
96 | ksym-wl := $(CONFIG_UNUSED_KSYMS_WHITELIST) | |
97 | ksym-wl := $(if $(filter-out /%, $(ksym-wl)),$(srctree)/)$(ksym-wl) | |
98 | modpost-args += -t $(addprefix -u , $(ksym-wl)) | |
99 | modpost-deps += $(ksym-wl) | |
100 | endif | |
101 | ||
3d57e1b7 MY |
102 | ifeq ($(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) | |
69bc8d38 | 109 | endif |
bcfedae7 | 110 | |
1747269a | 111 | else |
96d97f26 | 112 | |
fab546e6 | 113 | # set src + obj - they may be used in the modules's Makefile |
96d97f26 SR |
114 | obj := $(KBUILD_EXTMOD) |
115 | src := $(obj) | |
116 | ||
0d96fb20 | 117 | # Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS |
a2430b25 | 118 | include $(kbuild-file) |
e3fb4df7 | 119 | |
bcfedae7 MY |
120 | output-symdump := $(KBUILD_EXTMOD)/Module.symvers |
121 | ||
3d57e1b7 MY |
122 | ifeq ($(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 , $(KBUILD_EXTRA_SYMBOLS)) | |
91e6ee58 | 130 | |
f73edc89 | 131 | endif # ($(KBUILD_EXTMOD),) |
436b2ac6 | 132 | |
bcfedae7 | 133 | quiet_cmd_modpost = MODPOST $@ |
f73edc89 MY |
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."; \ | |
5573b4da MY |
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.";) \ | |
3d57e1b7 | 141 | $(MODPOST) $(modpost-args) |
436b2ac6 MY |
142 | |
143 | targets += $(output-symdump) | |
3d57e1b7 | 144 | $(output-symdump): $(modpost-deps) FORCE |
f73edc89 | 145 | $(call if_changed,modpost) |
bcfedae7 MY |
146 | |
147 | __modpost: $(output-symdump) | |
bcfedae7 MY |
148 | PHONY += FORCE |
149 | FORCE: | |
150 | ||
436b2ac6 MY |
151 | existing-targets := $(wildcard $(sort $(targets))) |
152 | ||
153 | -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) | |
154 | ||
4f193362 | 155 | .PHONY: $(PHONY) |