1 # SPDX-License-Identifier: GPL-2.0-only 1 # SPDX-License-Identifier: GPL-2.0-only
2 2
3 PHONY := __default 3 PHONY := __default
4 __default: vmlinux.o modules.builtin.modinfo m !! 4 __default: vmlinux.o
5 5
6 include include/config/auto.conf 6 include include/config/auto.conf
7 include $(srctree)/scripts/Kbuild.include 7 include $(srctree)/scripts/Kbuild.include
8 8
9 # for objtool 9 # for objtool
10 include $(srctree)/scripts/Makefile.lib 10 include $(srctree)/scripts/Makefile.lib
11 11
12 # Generate a linker script to ensure correct o 12 # Generate a linker script to ensure correct ordering of initcalls for Clang LTO
13 # -------------------------------------------- 13 # ---------------------------------------------------------------------------
14 14
15 quiet_cmd_gen_initcalls_lds = GEN $@ 15 quiet_cmd_gen_initcalls_lds = GEN $@
16 cmd_gen_initcalls_lds = \ 16 cmd_gen_initcalls_lds = \
17 $(PYTHON3) $(srctree)/scripts/jobserve 17 $(PYTHON3) $(srctree)/scripts/jobserver-exec \
18 $(PERL) $(real-prereqs) > $@ 18 $(PERL) $(real-prereqs) > $@
19 19
20 .tmp_initcalls.lds: $(srctree)/scripts/generat 20 .tmp_initcalls.lds: $(srctree)/scripts/generate_initcall_order.pl \
21 vmlinux.a $(KBUILD_VMLINUX_LIB !! 21 $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) FORCE
22 $(call if_changed,gen_initcalls_lds) 22 $(call if_changed,gen_initcalls_lds)
23 23
24 targets := .tmp_initcalls.lds 24 targets := .tmp_initcalls.lds
25 25
26 ifdef CONFIG_LTO_CLANG 26 ifdef CONFIG_LTO_CLANG
27 initcalls-lds := .tmp_initcalls.lds 27 initcalls-lds := .tmp_initcalls.lds
28 endif 28 endif
29 29
30 # objtool for vmlinux.o 30 # objtool for vmlinux.o
31 # -------------------------------------------- 31 # ---------------------------------------------------------------------------
32 # 32 #
33 # For LTO and IBT, objtool doesn't run on indi 33 # For LTO and IBT, objtool doesn't run on individual translation units.
34 # Run everything on vmlinux instead. 34 # Run everything on vmlinux instead.
35 35
36 objtool-enabled := $(or $(delay-objtool),$(CON 36 objtool-enabled := $(or $(delay-objtool),$(CONFIG_NOINSTR_VALIDATION))
37 37
38 vmlinux-objtool-args-$(delay-objtool) !! 38 # Reuse objtool_args defined in scripts/Makefile.lib if LTO or IBT is enabled.
39 vmlinux-objtool-args-$(CONFIG_GCOV_KERNEL) !! 39 #
40 vmlinux-objtool-args-$(CONFIG_NOINSTR_VALIDATI !! 40 # Add some more flags as needed.
41 !! 41 # --no-unreachable and --link might be added twice, but it is fine.
>> 42 #
>> 43 # Expand objtool_args to a simple variable to avoid circular reference.
42 44
43 objtool-args = $(vmlinux-objtool-args-y) --lin !! 45 objtool_args := \
>> 46 $(if $(delay-objtool),$(objtool_args)) \
>> 47 $(if $(CONFIG_NOINSTR_VALIDATION), --noinstr $(if $(CONFIG_CPU_UNRET_ENTRY), --unret)) \
>> 48 $(if $(CONFIG_GCOV_KERNEL), --no-unreachable) \
>> 49 --link
44 50
45 # Link of vmlinux.o used for section mismatch 51 # Link of vmlinux.o used for section mismatch analysis
46 # -------------------------------------------- 52 # ---------------------------------------------------------------------------
47 53
48 vmlinux-o-ld-args-$(CONFIG_BUILTIN_MODULE_RANG <<
49 <<
50 quiet_cmd_ld_vmlinux.o = LD $@ 54 quiet_cmd_ld_vmlinux.o = LD $@
51 cmd_ld_vmlinux.o = \ 55 cmd_ld_vmlinux.o = \
52 $(LD) ${KBUILD_LDFLAGS} -r -o $@ \ 56 $(LD) ${KBUILD_LDFLAGS} -r -o $@ \
53 $(vmlinux-o-ld-args-y) \ <<
54 $(addprefix -T , $(initcalls-lds)) \ 57 $(addprefix -T , $(initcalls-lds)) \
55 --whole-archive vmlinux.a --no-whole-a !! 58 --whole-archive $(KBUILD_VMLINUX_OBJS) --no-whole-archive \
56 --start-group $(KBUILD_VMLINUX_LIBS) - 59 --start-group $(KBUILD_VMLINUX_LIBS) --end-group \
57 $(cmd_objtool) 60 $(cmd_objtool)
58 61
59 define rule_ld_vmlinux.o 62 define rule_ld_vmlinux.o
60 $(call cmd_and_savecmd,ld_vmlinux.o) 63 $(call cmd_and_savecmd,ld_vmlinux.o)
61 $(call cmd,gen_objtooldep) 64 $(call cmd,gen_objtooldep)
62 endef 65 endef
63 66
64 vmlinux.o: $(initcalls-lds) vmlinux.a $(KBUILD !! 67 vmlinux.o: $(initcalls-lds) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) FORCE
65 $(call if_changed_rule,ld_vmlinux.o) 68 $(call if_changed_rule,ld_vmlinux.o)
66 69
67 targets += vmlinux.o 70 targets += vmlinux.o
68 71
69 # module.builtin.modinfo !! 72 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
70 # -------------------------------------------- <<
71 <<
72 OBJCOPYFLAGS_modules.builtin.modinfo := -j .mo <<
73 <<
74 targets += modules.builtin.modinfo <<
75 modules.builtin.modinfo: vmlinux.o FORCE <<
76 $(call if_changed,objcopy) <<
77 <<
78 # module.builtin <<
79 # -------------------------------------------- <<
80 <<
81 # The second line aids cases where multiple mo <<
82 <<
83 quiet_cmd_modules_builtin = GEN $@ <<
84 cmd_modules_builtin = \ <<
85 tr '\0' '\n' < $< | \ <<
86 sed -n 's/^[[:alnum:]:_]*\.file=//p' | <<
87 tr ' ' '\n' | uniq | sed -e 's:^:kerne <<
88 <<
89 targets += modules.builtin <<
90 modules.builtin: modules.builtin.modinfo FORCE <<
91 $(call if_changed,modules_builtin) <<
92 <<
93 # Add FORCE to the prerequisites of a target t <<
94 # -------------------------------------------- 73 # ---------------------------------------------------------------------------
95 74
96 PHONY += FORCE 75 PHONY += FORCE
97 FORCE: 76 FORCE:
98 77
99 # Read all saved command lines and dependencie 78 # Read all saved command lines and dependencies for the $(targets) we
100 # may be building above, using $(if_changed{,_ 79 # may be building above, using $(if_changed{,_dep}). As an
101 # optimization, we don't need to read them if 80 # optimization, we don't need to read them if the target does not
102 # exist, we will rebuild anyway in that case. 81 # exist, we will rebuild anyway in that case.
103 82
104 existing-targets := $(wildcard $(sort $(target 83 existing-targets := $(wildcard $(sort $(targets)))
105 84
106 -include $(foreach f,$(existing-targets),$(dir 85 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
107 86
108 .PHONY: $(PHONY) 87 .PHONY: $(PHONY)
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