| 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 |
| 13 | include $(srctree)/scripts/Makefile.lib |
| 14 | |
| 15 | # find all modules listed in modules.order |
| 16 | modules := $(call read-file, $(MODORDER)) |
| 17 | |
| 18 | __modfinal: $(modules:%.o=%.ko) |
| 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 | GCOV_PROFILE := n |
| 25 | KCSAN_SANITIZE := n |
| 26 | |
| 27 | quiet_cmd_cc_o_c = CC [M] $@ |
| 28 | cmd_cc_o_c = $(CC) $(filter-out $(CC_FLAGS_CFI), $(c_flags)) -c -o $@ $< |
| 29 | |
| 30 | %.mod.o: %.mod.c FORCE |
| 31 | $(call if_changed_dep,cc_o_c) |
| 32 | |
| 33 | quiet_cmd_ld_ko_o = LD [M] $@ |
| 34 | cmd_ld_ko_o += \ |
| 35 | $(LD) -r $(KBUILD_LDFLAGS) \ |
| 36 | $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \ |
| 37 | -T scripts/module.lds -o $@ $(filter %.o, $^) |
| 38 | |
| 39 | quiet_cmd_btf_ko = BTF [M] $@ |
| 40 | cmd_btf_ko = \ |
| 41 | if [ ! -f vmlinux ]; then \ |
| 42 | printf "Skipping BTF generation for %s due to unavailability of vmlinux\n" $@ 1>&2; \ |
| 43 | else \ |
| 44 | LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J $(PAHOLE_FLAGS) $(MODULE_PAHOLE_FLAGS) --btf_base vmlinux $@; \ |
| 45 | $(RESOLVE_BTFIDS) -b vmlinux $@; \ |
| 46 | fi; |
| 47 | |
| 48 | # Same as newer-prereqs, but allows to exclude specified extra dependencies |
| 49 | newer_prereqs_except = $(filter-out $(PHONY) $(1),$?) |
| 50 | |
| 51 | # Same as if_changed, but allows to exclude specified extra dependencies |
| 52 | if_changed_except = $(if $(call newer_prereqs_except,$(2))$(cmd-check), \ |
| 53 | $(cmd); \ |
| 54 | printf '%s\n' 'savedcmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:) |
| 55 | |
| 56 | # Re-generate module BTFs if either module's .ko or vmlinux changed |
| 57 | %.ko: %.o %.mod.o scripts/module.lds $(and $(CONFIG_DEBUG_INFO_BTF_MODULES),$(KBUILD_BUILTIN),vmlinux) FORCE |
| 58 | +$(call if_changed_except,ld_ko_o,vmlinux) |
| 59 | ifdef CONFIG_DEBUG_INFO_BTF_MODULES |
| 60 | +$(if $(newer-prereqs),$(call cmd,btf_ko)) |
| 61 | endif |
| 62 | |
| 63 | targets += $(modules:%.o=%.ko) $(modules:%.o=%.mod.o) |
| 64 | |
| 65 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. |
| 66 | # --------------------------------------------------------------------------- |
| 67 | |
| 68 | PHONY += FORCE |
| 69 | FORCE: |
| 70 | |
| 71 | # Read all saved command lines and dependencies for the $(targets) we |
| 72 | # may be building above, using $(if_changed{,_dep}). As an |
| 73 | # optimization, we don't need to read them if the target does not |
| 74 | # exist, we will rebuild anyway in that case. |
| 75 | |
| 76 | existing-targets := $(wildcard $(sort $(targets))) |
| 77 | |
| 78 | -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) |
| 79 | |
| 80 | .PHONY: $(PHONY) |