1 # SPDX-License-Identifier: GPL-2.0-only
2
3 PHONY := __default
4 __default: vmlinux.o modules.builtin.modinfo modules.builtin
5
6 include include/config/auto.conf
7 include $(srctree)/scripts/Kbuild.include
8
9 # for objtool
10 include $(srctree)/scripts/Makefile.lib
11
12 # Generate a linker script to ensure correct ordering of initcalls for Clang LTO
13 # ---------------------------------------------------------------------------
14
15 quiet_cmd_gen_initcalls_lds = GEN $@
16 cmd_gen_initcalls_lds = \
17 $(PYTHON3) $(srctree)/scripts/jobserver-exec \
18 $(PERL) $(real-prereqs) > $@
19
20 .tmp_initcalls.lds: $(srctree)/scripts/generate_initcall_order.pl \
21 vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE
22 $(call if_changed,gen_initcalls_lds)
23
24 targets := .tmp_initcalls.lds
25
26 ifdef CONFIG_LTO_CLANG
27 initcalls-lds := .tmp_initcalls.lds
28 endif
29
30 # objtool for vmlinux.o
31 # ---------------------------------------------------------------------------
32 #
33 # For LTO and IBT, objtool doesn't run on individual translation units.
34 # Run everything on vmlinux instead.
35
36 objtool-enabled := $(or $(delay-objtool),$(CONFIG_NOINSTR_VALIDATION))
37
38 vmlinux-objtool-args-$(delay-objtool) += $(objtool-args-y)
39 vmlinux-objtool-args-$(CONFIG_GCOV_KERNEL) += --no-unreachable
40 vmlinux-objtool-args-$(CONFIG_NOINSTR_VALIDATION) += --noinstr \
41 $(if $(or $(CONFIG_MITIGATION_UNRET_ENTRY),$(CONFIG_MITIGATION_SRSO)), --unret)
42
43 objtool-args = $(vmlinux-objtool-args-y) --link
44
45 # Link of vmlinux.o used for section mismatch analysis
46 # ---------------------------------------------------------------------------
47
48 quiet_cmd_ld_vmlinux.o = LD $@
49 cmd_ld_vmlinux.o = \
50 $(LD) ${KBUILD_LDFLAGS} -r -o $@ \
51 $(addprefix -T , $(initcalls-lds)) \
52 --whole-archive vmlinux.a --no-whole-archive \
53 --start-group $(KBUILD_VMLINUX_LIBS) --end-group \
54 $(cmd_objtool)
55
56 define rule_ld_vmlinux.o
57 $(call cmd_and_savecmd,ld_vmlinux.o)
58 $(call cmd,gen_objtooldep)
59 endef
60
61 vmlinux.o: $(initcalls-lds) vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE
62 $(call if_changed_rule,ld_vmlinux.o)
63
64 targets += vmlinux.o
65
66 # module.builtin.modinfo
67 # ---------------------------------------------------------------------------
68
69 OBJCOPYFLAGS_modules.builtin.modinfo := -j .modinfo -O binary
70
71 targets += modules.builtin.modinfo
72 modules.builtin.modinfo: vmlinux.o FORCE
73 $(call if_changed,objcopy)
74
75 # module.builtin
76 # ---------------------------------------------------------------------------
77
78 # The second line aids cases where multiple modules share the same object.
79
80 quiet_cmd_modules_builtin = GEN $@
81 cmd_modules_builtin = \
82 tr '\0' '\n' < $< | \
83 sed -n 's/^[[:alnum:]:_]*\.file=//p' | \
84 tr ' ' '\n' | uniq | sed -e 's:^:kernel/:' -e 's/$$/.ko/' > $@
85
86 targets += modules.builtin
87 modules.builtin: modules.builtin.modinfo FORCE
88 $(call if_changed,modules_builtin)
89
90 # Add FORCE to the prerequisites of a target to force it to be always rebuilt.
91 # ---------------------------------------------------------------------------
92
93 PHONY += FORCE
94 FORCE:
95
96 # Read all saved command lines and dependencies for the $(targets) we
97 # may be building above, using $(if_changed{,_dep}). As an
98 # optimization, we don't need to read them if the target does not
99 # exist, we will rebuild anyway in that case.
100
101 existing-targets := $(wildcard $(sort $(targets)))
102
103 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
104
105 .PHONY: $(PHONY)
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