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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 LT |
15 | # 2) modpost is then used to |
16 | # 3) create one <module>.mod.c file pr. module | |
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 SR |
35 | # KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined |
36 | # symbols in the final module linking stage | |
37 | # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. | |
25985edc | 38 | # This is solely useful to speed up test compiles |
a721588d MY |
39 | |
40 | PHONY := __modpost | |
41 | __modpost: | |
1da177e4 | 42 | |
c955ccaf | 43 | include include/config/auto.conf |
8ec4b4ff | 44 | include scripts/Kbuild.include |
0d96fb20 | 45 | |
dc5723b0 ST |
46 | # for ld_flags |
47 | include scripts/Makefile.lib | |
48 | ||
54b77847 JY |
49 | MODPOST = scripts/mod/modpost \ |
50 | $(if $(CONFIG_MODVERSIONS),-m) \ | |
51 | $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a) \ | |
54b77847 | 52 | $(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \ |
bcfedae7 MY |
53 | $(if $(KBUILD_MODPOST_WARN),-w) \ |
54 | -o $@ | |
a721588d MY |
55 | |
56 | ifdef MODPOST_VMLINUX | |
57 | ||
bcfedae7 MY |
58 | quiet_cmd_modpost = MODPOST $@ |
59 | cmd_modpost = $(MODPOST) $< | |
a721588d | 60 | |
269a535c | 61 | vmlinux.symvers: vmlinux.o |
a721588d MY |
62 | $(call cmd,modpost) |
63 | ||
269a535c | 64 | __modpost: vmlinux.symvers |
bcfedae7 | 65 | |
a721588d MY |
66 | else |
67 | ||
1747269a | 68 | ifeq ($(KBUILD_EXTMOD),) |
269a535c MY |
69 | |
70 | input-symdump := vmlinux.symvers | |
bcfedae7 MY |
71 | output-symdump := Module.symvers |
72 | ||
1747269a | 73 | else |
96d97f26 | 74 | |
fab546e6 | 75 | # set src + obj - they may be used in the modules's Makefile |
96d97f26 SR |
76 | obj := $(KBUILD_EXTMOD) |
77 | src := $(obj) | |
78 | ||
0d96fb20 RH |
79 | # Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS |
80 | include $(if $(wildcard $(KBUILD_EXTMOD)/Kbuild), \ | |
81 | $(KBUILD_EXTMOD)/Kbuild, $(KBUILD_EXTMOD)/Makefile) | |
e3fb4df7 MY |
82 | |
83 | # modpost option for external modules | |
84 | MODPOST += -e | |
85 | ||
f1005b30 | 86 | input-symdump := Module.symvers $(KBUILD_EXTRA_SYMBOLS) |
bcfedae7 MY |
87 | output-symdump := $(KBUILD_EXTMOD)/Module.symvers |
88 | ||
0d96fb20 RH |
89 | endif |
90 | ||
4e5ab74c MY |
91 | # modpost options for modules (both in-kernel and external) |
92 | MODPOST += \ | |
436b2ac6 | 93 | $(addprefix -i ,$(wildcard $(input-symdump))) \ |
859c926a | 94 | $(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS)) \ |
4e5ab74c MY |
95 | $(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N) |
96 | ||
91e6ee58 MY |
97 | # 'make -i -k' ignores compile errors, and builds as many modules as possible. |
98 | ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),) | |
99 | MODPOST += -n | |
100 | endif | |
101 | ||
48a0f727 MY |
102 | # Clear VPATH to not search for *.symvers in $(srctree). Check only $(objtree). |
103 | VPATH := | |
436b2ac6 | 104 | $(input-symdump): |
48a0f727 MY |
105 | @echo >&2 'WARNING: Symbol version dump "$@" is missing.' |
106 | @echo >&2 ' Modules may not have dependencies or modversions.' | |
436b2ac6 | 107 | |
dc5723b0 ST |
108 | ifdef CONFIG_LTO_CLANG |
109 | # With CONFIG_LTO_CLANG, .o files might be LLVM bitcode, so we need to run | |
110 | # LTO to compile them into native code before running modpost | |
111 | prelink-ext := .lto | |
112 | ||
113 | quiet_cmd_cc_lto_link_modules = LTO [M] $@ | |
38e89184 ST |
114 | cmd_cc_lto_link_modules = \ |
115 | $(LD) $(ld_flags) -r -o $@ \ | |
116 | $(shell [ -s $(@:.lto.o=.o.symversions) ] && \ | |
117 | echo -T $(@:.lto.o=.o.symversions)) \ | |
118 | --whole-archive $^ | |
dc5723b0 ST |
119 | |
120 | %.lto.o: %.o | |
121 | $(call if_changed,cc_lto_link_modules) | |
122 | endif | |
123 | ||
124 | modules := $(sort $(shell cat $(MODORDER))) | |
125 | ||
bcfedae7 | 126 | # Read out modules.order to pass in modpost. |
9b9a3f20 | 127 | # Otherwise, allmodconfig would fail with "Argument list too long". |
bcfedae7 | 128 | quiet_cmd_modpost = MODPOST $@ |
dc5723b0 | 129 | cmd_modpost = sed 's/\.ko$$/$(prelink-ext)\.o/' $< | $(MODPOST) -T - |
1da177e4 | 130 | |
dc5723b0 | 131 | $(output-symdump): $(MODORDER) $(input-symdump) $(modules:.ko=$(prelink-ext).o) FORCE |
436b2ac6 MY |
132 | $(call if_changed,modpost) |
133 | ||
134 | targets += $(output-symdump) | |
bcfedae7 MY |
135 | |
136 | __modpost: $(output-symdump) | |
9b9a3f20 MY |
137 | ifneq ($(KBUILD_MODPOST_NOFINAL),1) |
138 | $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal | |
139 | endif | |
4f193362 | 140 | |
bcfedae7 MY |
141 | PHONY += FORCE |
142 | FORCE: | |
143 | ||
436b2ac6 MY |
144 | existing-targets := $(wildcard $(sort $(targets))) |
145 | ||
146 | -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) | |
147 | ||
a721588d MY |
148 | endif |
149 | ||
4f193362 | 150 | .PHONY: $(PHONY) |