Commit | Line | Data |
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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 | |
ea837f1c | 35 | # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. |
25985edc | 36 | # This is solely useful to speed up test compiles |
a721588d MY |
37 | |
38 | PHONY := __modpost | |
39 | __modpost: | |
1da177e4 | 40 | |
c955ccaf | 41 | include include/config/auto.conf |
3204a7fb | 42 | include $(srctree)/scripts/Kbuild.include |
0d96fb20 | 43 | |
54b77847 JY |
44 | MODPOST = scripts/mod/modpost \ |
45 | $(if $(CONFIG_MODVERSIONS),-m) \ | |
46 | $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a) \ | |
54b77847 | 47 | $(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \ |
bcfedae7 | 48 | -o $@ |
a721588d MY |
49 | |
50 | ifdef MODPOST_VMLINUX | |
51 | ||
bcfedae7 MY |
52 | quiet_cmd_modpost = MODPOST $@ |
53 | cmd_modpost = $(MODPOST) $< | |
a721588d | 54 | |
269a535c | 55 | vmlinux.symvers: vmlinux.o |
a721588d MY |
56 | $(call cmd,modpost) |
57 | ||
269a535c | 58 | __modpost: vmlinux.symvers |
bcfedae7 | 59 | |
a721588d MY |
60 | else |
61 | ||
1747269a | 62 | ifeq ($(KBUILD_EXTMOD),) |
269a535c MY |
63 | |
64 | input-symdump := vmlinux.symvers | |
69bc8d38 MY |
65 | output-symdump := modules-only.symvers |
66 | ||
67 | quiet_cmd_cat = GEN $@ | |
68 | cmd_cat = cat $(real-prereqs) > $@ | |
69 | ||
70 | ifneq ($(wildcard vmlinux.symvers),) | |
71 | ||
72 | __modpost: Module.symvers | |
73 | Module.symvers: vmlinux.symvers modules-only.symvers FORCE | |
74 | $(call if_changed,cat) | |
75 | ||
76 | targets += Module.symvers | |
77 | ||
78 | endif | |
bcfedae7 | 79 | |
1747269a | 80 | else |
96d97f26 | 81 | |
fab546e6 | 82 | # set src + obj - they may be used in the modules's Makefile |
96d97f26 SR |
83 | obj := $(KBUILD_EXTMOD) |
84 | src := $(obj) | |
85 | ||
0d96fb20 | 86 | # Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS |
c9db1884 | 87 | include $(or $(wildcard $(src)/Kbuild), $(src)/Makefile) |
e3fb4df7 MY |
88 | |
89 | # modpost option for external modules | |
90 | MODPOST += -e | |
91 | ||
f1005b30 | 92 | input-symdump := Module.symvers $(KBUILD_EXTRA_SYMBOLS) |
bcfedae7 MY |
93 | output-symdump := $(KBUILD_EXTMOD)/Module.symvers |
94 | ||
0d96fb20 RH |
95 | endif |
96 | ||
4475dff5 MY |
97 | existing-input-symdump := $(wildcard $(input-symdump)) |
98 | ||
4e5ab74c MY |
99 | # modpost options for modules (both in-kernel and external) |
100 | MODPOST += \ | |
4475dff5 | 101 | $(addprefix -i ,$(existing-input-symdump)) \ |
859c926a | 102 | $(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS)) \ |
4e5ab74c MY |
103 | $(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N) |
104 | ||
91e6ee58 MY |
105 | # 'make -i -k' ignores compile errors, and builds as many modules as possible. |
106 | ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),) | |
107 | MODPOST += -n | |
108 | endif | |
109 | ||
48a0f727 MY |
110 | # Clear VPATH to not search for *.symvers in $(srctree). Check only $(objtree). |
111 | VPATH := | |
436b2ac6 | 112 | $(input-symdump): |
48a0f727 MY |
113 | @echo >&2 'WARNING: Symbol version dump "$@" is missing.' |
114 | @echo >&2 ' Modules may not have dependencies or modversions.' | |
4475dff5 | 115 | @echo >&2 ' You may get many unresolved symbol warnings.' |
436b2ac6 | 116 | |
5ab70ff4 | 117 | # KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined symbols |
4475dff5 | 118 | ifneq ($(KBUILD_MODPOST_WARN)$(filter-out $(existing-input-symdump), $(input-symdump)),) |
5ab70ff4 MY |
119 | MODPOST += -w |
120 | endif | |
121 | ||
bcfedae7 | 122 | # Read out modules.order to pass in modpost. |
9b9a3f20 | 123 | # Otherwise, allmodconfig would fail with "Argument list too long". |
bcfedae7 | 124 | quiet_cmd_modpost = MODPOST $@ |
c25e1c55 | 125 | cmd_modpost = sed 's/ko$$/o/' $< | $(MODPOST) -T - |
1da177e4 | 126 | |
c25e1c55 | 127 | $(output-symdump): $(MODORDER) $(input-symdump) FORCE |
436b2ac6 MY |
128 | $(call if_changed,modpost) |
129 | ||
130 | targets += $(output-symdump) | |
bcfedae7 MY |
131 | |
132 | __modpost: $(output-symdump) | |
9b9a3f20 MY |
133 | ifneq ($(KBUILD_MODPOST_NOFINAL),1) |
134 | $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal | |
135 | endif | |
4f193362 | 136 | |
bcfedae7 MY |
137 | PHONY += FORCE |
138 | FORCE: | |
139 | ||
436b2ac6 MY |
140 | existing-targets := $(wildcard $(sort $(targets))) |
141 | ||
142 | -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) | |
143 | ||
a721588d MY |
144 | endif |
145 | ||
4f193362 | 146 | .PHONY: $(PHONY) |