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Linux/scripts/Makefile.modpost

  1 # ===========================================================================
  2 # Module versions
  3 # ===========================================================================
  4 #
  5 # Stage one of module building created the following:
  6 # a) The individual .o files used for the module
  7 # b) A <module>.o file which is the .o files above linked together
  8 # c) A <module>.mod file in $(MODVERDIR)/, listing the name of the
  9 #    the preliminary <module>.o file, plus all .o files
 10 
 11 # Stage 2 is handled by this file and does the following
 12 # 1) Find all modules from the files listed in $(MODVERDIR)/
 13 # 2) modpost is then used to
 14 # 3)  create one <module>.mod.c file pr. module
 15 # 4)  create one Module.symvers file with CRC for all exported symbols
 16 # 5) compile all <module>.mod.c files
 17 # 6) final link of the module to a <module.ko> file
 18 
 19 # Step 3 is used to place certain information in the module's ELF
 20 # section, including information such as:
 21 #   Version magic (see include/linux/vermagic.h for full details)
 22 #     - Kernel release
 23 #     - SMP is CONFIG_SMP
 24 #     - PREEMPT is CONFIG_PREEMPT
 25 #     - GCC Version
 26 #   Module info
 27 #     - Module version (MODULE_VERSION)
 28 #     - Module alias'es (MODULE_ALIAS)
 29 #     - Module license (MODULE_LICENSE)
 30 #     - See include/linux/module.h for more details
 31 
 32 # Step 4 is solely used to allow module versioning in external modules,
 33 # where the CRC of each module is retrieved from the Module.symvers file.
 34 
 35 # KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined
 36 # symbols in the final module linking stage
 37 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
 38 # This is solely useful to speed up test compiles
 39 PHONY := _modpost
 40 _modpost: __modpost
 41 
 42 include include/config/auto.conf
 43 include scripts/Kbuild.include
 44 
 45 # When building external modules load the Kbuild file to retrieve EXTRA_SYMBOLS info
 46 ifneq ($(KBUILD_EXTMOD),)
 47 
 48 # set src + obj - they may be used when building the .mod.c file
 49 obj := $(KBUILD_EXTMOD)
 50 src := $(obj)
 51 
 52 # Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS
 53 include $(if $(wildcard $(KBUILD_EXTMOD)/Kbuild), \
 54              $(KBUILD_EXTMOD)/Kbuild, $(KBUILD_EXTMOD)/Makefile)
 55 endif
 56 
 57 include scripts/Makefile.lib
 58 
 59 kernelsymfile := $(objtree)/Module.symvers
 60 modulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers
 61 
 62 # Step 1), find all modules listed in $(MODVERDIR)/
 63 MODLISTCMD := find $(MODVERDIR) -name '*.mod' | xargs -r grep -h '\.ko$$' | sort -u
 64 __modules := $(shell $(MODLISTCMD))
 65 modules   := $(patsubst %.o,%.ko, $(wildcard $(__modules:.ko=.o)))
 66 
 67 # Stop after building .o files if NOFINAL is set. Makes compile tests quicker
 68 _modpost: $(if $(KBUILD_MODPOST_NOFINAL), $(modules:.ko:.o),$(modules))
 69 
 70 # Step 2), invoke modpost
 71 #  Includes step 3,4
 72 modpost = scripts/mod/modpost                    \
 73  $(if $(CONFIG_MODVERSIONS),-m)                  \
 74  $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a,)       \
 75  $(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile)   \
 76  $(if $(KBUILD_EXTMOD),-I $(modulesymfile))      \
 77  $(if $(KBUILD_EXTRA_SYMBOLS), $(patsubst %, -e %,$(KBUILD_EXTRA_SYMBOLS))) \
 78  $(if $(KBUILD_EXTMOD),-o $(modulesymfile))      \
 79  $(if $(CONFIG_DEBUG_SECTION_MISMATCH),,-S)      \
 80  $(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E)  \
 81  $(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),-w)
 82 
 83 MODPOST_OPT=$(subst -i,-n,$(filter -i,$(MAKEFLAGS)))
 84 
 85 # We can go over command line length here, so be careful.
 86 quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules
 87       cmd_modpost = $(MODLISTCMD) | sed 's/\.ko$$/.o/' | $(modpost) $(MODPOST_OPT) -s -T -
 88 
 89 PHONY += __modpost
 90 __modpost: $(modules:.ko=.o) FORCE
 91         $(call cmd,modpost) $(wildcard vmlinux)
 92 
 93 quiet_cmd_kernel-mod = MODPOST $@
 94       cmd_kernel-mod = $(modpost) $@
 95 
 96 vmlinux.o: FORCE
 97         $(call cmd,kernel-mod)
 98 
 99 # Declare generated files as targets for modpost
100 $(symverfile):         __modpost ;
101 $(modules:.ko=.mod.c): __modpost ;
102 
103 
104 # Step 5), compile all *.mod.c files
105 
106 # modname is set to make c_flags define KBUILD_MODNAME
107 modname = $(notdir $(@:.mod.o=))
108 
109 quiet_cmd_cc_o_c = CC      $@
110       cmd_cc_o_c = $(CC) $(c_flags) $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE) \
111                    -c -o $@ $<
112 
113 $(modules:.ko=.mod.o): %.mod.o: %.mod.c FORCE
114         $(call if_changed_dep,cc_o_c)
115 
116 targets += $(modules:.ko=.mod.o)
117 
118 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
119 
120 # Step 6), final link of the modules with optional arch pass after final link
121 quiet_cmd_ld_ko_o = LD [M]  $@
122       cmd_ld_ko_o =                                                     \
123         $(LD) -r $(LDFLAGS)                                             \
124                  $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE)             \
125                  -o $@ $(filter-out FORCE,$^) ;                         \
126         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
127 
128 $(modules): %.ko :%.o %.mod.o FORCE
129         +$(call if_changed,ld_ko_o)
130 
131 targets += $(modules)
132 
133 
134 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
135 # ---------------------------------------------------------------------------
136 
137 PHONY += FORCE
138 
139 FORCE:
140 
141 # Read all saved command lines and dependencies for the $(targets) we
142 # may be building above, using $(if_changed{,_dep}). As an
143 # optimization, we don't need to read them if the target does not
144 # exist, we will rebuild anyway in that case.
145 
146 targets := $(wildcard $(sort $(targets)))
147 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
148 
149 ifneq ($(cmd_files),)
150   include $(cmd_files)
151 endif
152 
153 
154 # Declare the contents of the .PHONY variable as phony.  We keep that
155 # information in a variable se we can use it in if_changed and friends.
156 
157 .PHONY: $(PHONY)

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