1 files changed, 98 insertions, 0 deletions
diff --git a/scripts/Makefile.modfinal b/scripts/Makefile.modfinal
new file mode 100644
index 000000000..9ae3d9ae3
--- /dev/null
+++ b/scripts/Makefile.modfinal
@@ -0,0 +1,98 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# ===========================================================================
+# Module final link
+# ===========================================================================
+
+PHONY := __modfinal
+__modfinal:
+
+include $(objtree)/include/config/auto.conf
+include $(srctree)/scripts/Kbuild.include
+
+# for c_flags and objtool_args
+include $(srctree)/scripts/Makefile.lib
+
+# find all modules listed in modules.order
+modules := $(sort $(shell cat $(MODORDER)))
+
+__modfinal: $(modules)
+	@:
+
+# modname and part-of-module are set to make c_flags define proper module flags
+modname = $(notdir $(@:.mod.o=))
+part-of-module = y
+
+quiet_cmd_cc_o_c = CC [M]  $@
+      cmd_cc_o_c =							\
+		$(CC) $(filter-out $(CC_FLAGS_CFI) $(CC_FLAGS_FTRACE),	\
+			$(c_flags)) -c -o $@ $<
+
+%.mod.o: %.mod.c FORCE
+	$(call if_changed_dep,cc_o_c)
+
+ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
+
+ifdef CONFIG_LTO_CLANG
+# With CONFIG_LTO_CLANG, reuse the object file we compiled for modpost to
+# avoid a second slow LTO link
+prelink-ext := .lto
+
+# ELF processing was skipped earlier because we didn't have native code,
+# so let's now process the prelinked binary before we link the module.
+
+ifdef CONFIG_STACK_VALIDATION
+ifneq ($(SKIP_STACK_VALIDATION),1)
+cmd_ld_ko_o +=								\
+	$(objtree)/tools/objtool/objtool $(objtool_args)		\
+		$(@:.ko=$(prelink-ext).o);
+
+endif # SKIP_STACK_VALIDATION
+endif # CONFIG_STACK_VALIDATION
+
+endif # CONFIG_LTO_CLANG
+
+quiet_cmd_ld_ko_o = LD [M]  $@
+      cmd_ld_ko_o +=							\
+	$(LD) -r $(KBUILD_LDFLAGS)					\
+		$(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE)		\
+		-T scripts/module.lds -o $@ $(filter %.o, $^);		\
+	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
+
+ifdef CONFIG_CFI_CLANG
+# LLVM can drops jump table symbols from the final binary. Add them
+# back to make stack traces and other symbol output readable.
+cmd_ld_ko_o += ;							\
+	$(srctree)/scripts/generate_cfi_kallsyms.pl --module		\
+		$@ > $(@:.ko=.lds);					\
+	if [ -s $(@:.ko=.lds) ]; then					\
+		$(LD) -r $(KBUILD_LDFLAGS) 				\
+			$(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE)	\
+			-T $(@:.ko=.lds)				\
+			-o $(@:.ko=.tmp.ko) $@;				\
+		mv -f $(@:.ko=.tmp.ko) $@;				\
+	else								\
+		rm -f $(@:.ko=.lds);					\
+	fi
+endif
+
+$(modules): %.ko: %$(prelink-ext).o %.mod.o scripts/module.lds FORCE
+	+$(call if_changed,ld_ko_o)
+
+targets += $(modules) $(modules:.ko=.mod.o)
+
+# Add FORCE to the prequisites of a target to force it to be always rebuilt.
+# ---------------------------------------------------------------------------
+
+PHONY += FORCE
+FORCE:
+
+# Read all saved command lines and dependencies for the $(targets) we
+# may be building above, using $(if_changed{,_dep}). As an
+# optimization, we don't need to read them if the target does not
+# exist, we will rebuild anyway in that case.
+
+existing-targets := $(wildcard $(sort $(targets)))
+
+-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
+
+.PHONY: $(PHONY)