1# SPDX-License-Identifier: GPL-2.0-only
2
3PHONY := __default
4__default: vmlinux.o modules.builtin.modinfo modules.builtin
5
6include include/config/auto.conf
7include $(srctree)/scripts/Kbuild.include
8
9# for objtool
10include $(srctree)/scripts/Makefile.lib
11
12# Generate a linker script to ensure correct ordering of initcalls for Clang LTO
13# ---------------------------------------------------------------------------
14
15quiet_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
24targets := .tmp_initcalls.lds
25
26ifdef CONFIG_LTO_CLANG
27initcalls-lds := .tmp_initcalls.lds
28endif
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
36objtool-enabled := $(or $(delay-objtool),$(CONFIG_NOINSTR_VALIDATION))
37
38vmlinux-objtool-args-$(delay-objtool)			+= $(objtool-args-y)
39vmlinux-objtool-args-$(CONFIG_GCOV_KERNEL)		+= --no-unreachable
40vmlinux-objtool-args-$(CONFIG_NOINSTR_VALIDATION)	+= --noinstr \
41							   $(if $(or $(CONFIG_MITIGATION_UNRET_ENTRY),$(CONFIG_MITIGATION_SRSO)), --unret)
42
43objtool-args = $(vmlinux-objtool-args-y) --link
44
45# Link of vmlinux.o used for section mismatch analysis
46# ---------------------------------------------------------------------------
47
48quiet_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
56define rule_ld_vmlinux.o
57	$(call cmd_and_savecmd,ld_vmlinux.o)
58	$(call cmd,gen_objtooldep)
59endef
60
61vmlinux.o: $(initcalls-lds) vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE
62	$(call if_changed_rule,ld_vmlinux.o)
63
64targets += vmlinux.o
65
66# module.builtin.modinfo
67# ---------------------------------------------------------------------------
68
69OBJCOPYFLAGS_modules.builtin.modinfo := -j .modinfo -O binary
70
71targets += modules.builtin.modinfo
72modules.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
80quiet_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
86targets += modules.builtin
87modules.builtin: modules.builtin.modinfo FORCE
88	$(call if_changed,modules_builtin)
89
90# Add FORCE to the prequisites of a target to force it to be always rebuilt.
91# ---------------------------------------------------------------------------
92
93PHONY += FORCE
94FORCE:
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
101existing-targets := $(wildcard $(sort $(targets)))
102
103-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
104
105.PHONY: $(PHONY)
106