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