scripts/Makefile.modfinal

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 # ===========================================================================
   3 # Module final link
   4 # ===========================================================================
   5
   6 PHONY := __modfinal
   7 __modfinal:
   8
   9 include include/config/auto.conf
  10 include $(srctree)/scripts/Kbuild.include
  11
  12 # for c_flags and objtool_args
  13 include $(srctree)/scripts/Makefile.lib
  14
  15 # find all modules listed in modules.order
  16 modules := $(sort $(shell cat $(MODORDER)))
  17
  18 __modfinal: $(modules)
  19         @:
  20
  21 # modname and part-of-module are set to make c_flags define proper module flags
  22 modname = $(notdir $(@:.mod.o=))
  23 part-of-module = y
  24
  25 quiet_cmd_cc_o_c = CC [M]  $@
  26       cmd_cc_o_c = $(CC) $(filter-out $(CC_FLAGS_CFI), $(c_flags)) -c -o $@ $<
  27
  28 %.mod.o: %.mod.c FORCE
  29         $(call if_changed_dep,cc_o_c)
  30
  31 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
  32
  33 ifdef CONFIG_LTO_CLANG
  34 # With CONFIG_LTO_CLANG, reuse the object file we compiled for modpost to
  35 # avoid a second slow LTO link
  36 prelink-ext := .lto
  37
  38 # ELF processing was skipped earlier because we didn't have native code,
  39 # so let's now process the prelinked binary before we link the module.
  40
  41 ifdef CONFIG_STACK_VALIDATION
  42 ifneq ($(SKIP_STACK_VALIDATION),1)
  43 cmd_ld_ko_o +=                                                          \
  44         $(objtree)/tools/objtool/objtool $(objtool_args)                \
  45                 $(@:.ko=$(prelink-ext).o);
  46
  47 endif # SKIP_STACK_VALIDATION
  48 endif # CONFIG_STACK_VALIDATION
  49
  50 endif # CONFIG_LTO_CLANG
  51
  52 quiet_cmd_ld_ko_o = LD [M]  $@
  53       cmd_ld_ko_o +=                                                    \
  54         $(LD) -r $(KBUILD_LDFLAGS)                                      \
  55                 $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE)              \
  56                 -T scripts/module.lds -o $@ $(filter %.o, $^);          \
  57         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
  58
  59 quiet_cmd_btf_ko = BTF [M] $@
  60       cmd_btf_ko =                                                      \
  61         if [ -f vmlinux ]; then                                         \
  62                 LLVM_OBJCOPY=$(OBJCOPY) $(PAHOLE) -J --btf_base vmlinux $@; \
  63         else                                                            \
  64                 printf "Skipping BTF generation for %s due to unavailability of vmlinux\n" $@ 1>&2; \
  65         fi;
  66
  67 # Same as newer-prereqs, but allows to exclude specified extra dependencies
  68 newer_prereqs_except = $(filter-out $(PHONY) $(1),$?)
  69
  70 # Same as if_changed, but allows to exclude specified extra dependencies
  71 if_changed_except = $(if $(call newer_prereqs_except,$(2))$(cmd-check),      \
  72         $(cmd);                                                              \
  73         printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
  74
  75
  76 # Re-generate module BTFs if either module's .ko or vmlinux changed
  77 $(modules): %.ko: %$(prelink-ext).o %.mod.o scripts/module.lds $(if $(KBUILD_BUILTIN),vmlinux) FORCE
  78         +$(call if_changed_except,ld_ko_o,vmlinux)
  79 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
  80         +$(if $(newer-prereqs),$(call cmd,btf_ko))
  81 endif
  82
  83 targets += $(modules) $(modules:.ko=.mod.o)
  84
  85 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
  86 # ---------------------------------------------------------------------------
  87
  88 PHONY += FORCE
  89 FORCE:
  90
  91 # Read all saved command lines and dependencies for the $(targets) we
  92 # may be building above, using $(if_changed{,_dep}). As an
  93 # optimization, we don't need to read them if the target does not
  94 # exist, we will rebuild anyway in that case.
  95
  96 existing-targets := $(wildcard $(sort $(targets)))
  97
  98 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
  99
 100 .PHONY: $(PHONY)