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 prerequisites 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)
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