1 # SPDX-License-Identifier: GPL-2.0 <<
2 # ============================================ 1 # ===========================================================================
3 # Module versions 2 # Module versions
4 # ============================================ 3 # ===========================================================================
>> 4
>> 5 .PHONY: __modversions
>> 6 __modversions:
>> 7
>> 8 include .config
>> 9 include scripts/Makefile.lib
>> 10
5 # 11 #
6 # Stage one of module building created the fol <<
7 # a) The individual .o files used for the modu <<
8 # b) A <module>.o file which is the .o files a <<
9 # c) A <module>.mod file, listing the name of <<
10 # plus all .o files <<
11 # d) modules.order, which lists all the module <<
12 <<
13 # Stage 2 is handled by this file and does the <<
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 modul <<
17 # 4) create one Module.symvers file with CRC <<
18 <<
19 # Step 3 is used to place certain information <<
20 # section, including information such as: <<
21 # Version magic (see include/linux/vermagic. <<
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 de <<
31 <<
32 # Step 4 is solely used to allow module versio <<
33 # where the CRC of each module is retrieved fr <<
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),- <<
47 $(if $(CONFIG_SECTION_MISMATCH_WARN_ON <<
48 $(if $(KBUILD_MODPOST_WARN),-w) <<
49 $(if $(KBUILD_NSDEPS),-d $(MODULES_NSD <<
50 $(if $(CONFIG_MODULE_ALLOW_MISSING_NAM <<
51 $(if $(findstring 1, $(KBUILD_EXTRA_WA <<
52 -o $@ <<
53 <<
54 modpost-deps := $(MODPOST) <<
55 <<
56 # 'make -i -k' ignores compile errors, and bui <<
57 ifneq ($(findstring i,$(filter-out --%,$(MAKEF <<
58 modpost-args += -n <<
59 endif <<
60 12
61 # Read out modules.order to pass in modpost. !! 13 __modules := $(shell cat /dev/null $(wildcard $(MODVERDIR)/*.mod))
62 # Otherwise, allmodconfig would fail with "Arg !! 14 modules := $(patsubst %.o,%.ko,$(wildcard $(__modules:.ko=.o)))
63 ifdef KBUILD_MODULES !! 15
64 modpost-args += -T $(MODORDER) !! 16 ifneq ($(filter-out $(modules),$(__modules)),)
65 modpost-deps += $(MODORDER) !! 17 $(warning *** Uh-oh, you have stale module entries. You messed with SUBDIRS,)
>> 18 $(warning do not complain if something goes wrong.)
66 endif 19 endif
67 20
68 ifeq ($(KBUILD_EXTMOD),) !! 21 __modversions: $(modules)
>> 22 @:
69 23
70 # Generate the list of in-tree objects in vmli !! 24 # The final module link
71 # -------------------------------------------- <<
72 25
73 # This is used to retrieve symbol versions gen !! 26 quiet_cmd_ld_ko_o = LD [M] $@
74 ifdef CONFIG_MODVERSIONS !! 27 cmd_ld_ko_o = $(LD) $(LDFLAGS) $(LDFLAGS_MODULE) -o $@ \
75 vmlinux.symvers Module.symvers: .vmlinux.objs !! 28 $(filter-out FORCE,$^)
76 endif <<
77 29
78 # Ignore libgcc.a !! 30 $(modules): %.ko :%.o %.mod.o FORCE
79 # Some architectures do '$(CC) --print-libgcc- !! 31 $(call if_changed,ld_ko_o)
80 # from the toolchain, but there is no EXPORT_S <<
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 <<
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 /%, $(ksym-wl)),$ <<
98 modpost-args += -t $(addprefix -u , $(ksym-wl) <<
99 modpost-deps += $(ksym-wl) <<
100 endif <<
101 32
102 ifeq ($(wildcard vmlinux.o),) !! 33 targets += $(modules)
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), Modu <<
109 endif <<
110 34
111 else !! 35 # Compile version info for unresolved symbols
112 36
113 # set src + obj - they may be used in the modu !! 37 quiet_cmd_cc_o_c = CC $@
114 obj := $(KBUILD_EXTMOD) !! 38 cmd_cc_o_c = $(CC) $(c_flags) $(CFLAGS_MODULE) \
115 src := $(if $(VPATH),$(VPATH)/)$(obj) !! 39 -c -o $@ $<
116 <<
117 # Include the module's Makefile to find KBUILD <<
118 include $(kbuild-file) <<
119 <<
120 output-symdump := $(KBUILD_EXTMOD)/Module.symv <<
121 <<
122 ifeq ($(wildcard Module.symvers),) <<
123 missing-input := Module.symvers <<
124 else <<
125 modpost-args += -i Module.symvers <<
126 modpost-deps += Module.symvers <<
127 endif <<
128 40
129 modpost-args += -e $(addprefix -i , $(KBUILD_E !! 41 $(modules:.ko=.mod.o): %.mod.o: %.mod.c FORCE
>> 42 $(call if_changed_dep,cc_o_c)
130 43
131 endif # ($(KBUILD_EXTMOD),) !! 44 targets += $(modules:.ko=.mod.o)
132 45
133 quiet_cmd_modpost = MODPOST $@ !! 46 # All the .mod.c files are generated using the helper "modpost"
134 cmd_modpost = \ <<
135 $(if $(missing-input), \ <<
136 echo >&2 "WARNING: $(missing-i <<
137 echo >&2 " Modules may <<
138 echo >&2 " You may get <<
139 echo >&2 " You can set <<
140 echo >&2 " if you want <<
141 $(MODPOST) $(modpost-args) <<
142 47
143 targets += $(output-symdump) !! 48 .PHONY: __modpost
144 $(output-symdump): $(modpost-deps) FORCE !! 49
>> 50 $(modules:.ko=.mod.c): __modpost ;
>> 51
>> 52 # Extract all checksums for all exported symbols
>> 53
>> 54 quiet_cmd_modpost = MODPOST
>> 55 cmd_modpost = scripts/modpost $(filter-out FORCE,$^)
>> 56
>> 57 __modpost: $(wildcard vmlinux) $(modules:.ko=.o) FORCE
145 $(call if_changed,modpost) 58 $(call if_changed,modpost)
146 59
147 __modpost: $(output-symdump) !! 60 targets += __modpost
148 PHONY += FORCE !! 61
>> 62 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
>> 63 # ---------------------------------------------------------------------------
>> 64
>> 65 .PHONY: FORCE
>> 66
149 FORCE: 67 FORCE:
150 68
151 existing-targets := $(wildcard $(sort $(target !! 69 # Read all saved command lines and dependencies for the $(targets) we
>> 70 # may be building above, using $(if_changed{,_dep}). As an
>> 71 # optimization, we don't need to read them if the target does not
>> 72 # exist, we will rebuild anyway in that case.
152 73
153 -include $(foreach f,$(existing-targets),$(dir !! 74 targets := $(wildcard $(sort $(targets)))
>> 75 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
154 76
155 .PHONY: $(PHONY) !! 77 ifneq ($(cmd_files),)
>> 78 include $(cmd_files)
>> 79 endif
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