1# SPDX-License-Identifier: GPL-2.0-only
  2
  3PHONY := __default
  4__default: __KEEPMAKEFILEO__B.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 $(CONFIG_CPU_UNRET_ENTRY),$(CONFIG_CPU_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: __KEEPMAKEFILEO__H.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)