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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)
1# SPDX-License-Identifier: GPL-2.0-only
2# ===========================================================================
3# Module final link
4# ===========================================================================
5
6PHONY := __modfinal
7__modfinal:
8
9include $(objtree)/include/config/auto.conf
10include $(srctree)/scripts/Kbuild.include
11include $(srctree)/scripts/Makefile.lib
12
13# find all modules listed in modules.order
14modules := $(call read-file, modules.order)
15
16__modfinal: $(modules:%.o=%.ko)
17 @:
18
19# modname and part-of-module are set to make c_flags define proper module flags
20modname = $(notdir $(@:.mod.o=))
21part-of-module = y
22GCOV_PROFILE := n
23ccflags-remove-y := $(CC_FLAGS_CFI)
24
25%.mod.o: %.mod.c FORCE
26 $(call if_changed_rule,cc_o_c)
27
28.module-common.o: $(srctree)/scripts/module-common.c FORCE
29 $(call if_changed_rule,cc_o_c)
30
31quiet_cmd_ld_ko_o = LD [M] $@
32 cmd_ld_ko_o = \
33 $(LD) -r $(KBUILD_LDFLAGS) \
34 $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \
35 -T $(objtree)/scripts/module.lds -o $@ $(filter %.o, $^)
36
37quiet_cmd_btf_ko = BTF [M] $@
38 cmd_btf_ko = \
39 if [ ! -f $(objtree)/vmlinux ]; then \
40 printf "Skipping BTF generation for %s due to unavailability of vmlinux\n" $@ 1>&2; \
41 else \
42 LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J $(PAHOLE_FLAGS) $(MODULE_PAHOLE_FLAGS) --btf_base $(objtree)/vmlinux $@; \
43 $(RESOLVE_BTFIDS) -b $(objtree)/vmlinux $@; \
44 fi;
45
46# Same as newer-prereqs, but allows to exclude specified extra dependencies
47newer_prereqs_except = $(filter-out $(PHONY) $(1),$?)
48
49# Same as if_changed, but allows to exclude specified extra dependencies
50if_changed_except = $(if $(call newer_prereqs_except,$(2))$(cmd-check), \
51 $(cmd); \
52 printf '%s\n' 'savedcmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
53
54# Re-generate module BTFs if either module's .ko or vmlinux changed
55%.ko: %.o %.mod.o .module-common.o $(objtree)/scripts/module.lds $(and $(CONFIG_DEBUG_INFO_BTF_MODULES),$(KBUILD_BUILTIN),$(objtree)/vmlinux) FORCE
56 +$(call if_changed_except,ld_ko_o,$(objtree)/vmlinux)
57ifdef CONFIG_DEBUG_INFO_BTF_MODULES
58 +$(if $(newer-prereqs),$(call cmd,btf_ko))
59endif
60
61targets += $(modules:%.o=%.ko) $(modules:%.o=%.mod.o) .module-common.o
62
63# Add FORCE to the prerequisites of a target to force it to be always rebuilt.
64# ---------------------------------------------------------------------------
65
66PHONY += FORCE
67FORCE:
68
69# Read all saved command lines and dependencies for the $(targets) we
70# may be building above, using $(if_changed{,_dep}). As an
71# optimization, we don't need to read them if the target does not
72# exist, we will rebuild anyway in that case.
73
74existing-targets := $(wildcard $(sort $(targets)))
75
76-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
77
78.PHONY: $(PHONY)