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