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