15d45950dSMasahiro Yamada# SPDX-License-Identifier: GPL-2.0-only 25d45950dSMasahiro Yamada 35d45950dSMasahiro YamadaPHONY := __default 4*39cfd5b1SMasahiro Yamada__default: vmlinux.o 55d45950dSMasahiro Yamada 65d45950dSMasahiro Yamadainclude include/config/auto.conf 75d45950dSMasahiro Yamadainclude $(srctree)/scripts/Kbuild.include 85d45950dSMasahiro Yamada 9b42d2306SMasahiro Yamada# for objtool 10b42d2306SMasahiro Yamadainclude $(srctree)/scripts/Makefile.lib 11b42d2306SMasahiro Yamada 125d45950dSMasahiro Yamada# Generate a linker script to ensure correct ordering of initcalls for Clang LTO 135d45950dSMasahiro Yamada# --------------------------------------------------------------------------- 145d45950dSMasahiro Yamada 155d45950dSMasahiro Yamadaquiet_cmd_gen_initcalls_lds = GEN $@ 165d45950dSMasahiro Yamada cmd_gen_initcalls_lds = \ 175d45950dSMasahiro Yamada $(PYTHON3) $(srctree)/scripts/jobserver-exec \ 185d45950dSMasahiro Yamada $(PERL) $(real-prereqs) > $@ 195d45950dSMasahiro Yamada 205d45950dSMasahiro Yamada.tmp_initcalls.lds: $(srctree)/scripts/generate_initcall_order.pl \ 2132164845SMasahiro Yamada vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE 225d45950dSMasahiro Yamada $(call if_changed,gen_initcalls_lds) 235d45950dSMasahiro Yamada 245d45950dSMasahiro Yamadatargets := .tmp_initcalls.lds 255d45950dSMasahiro Yamada 265d45950dSMasahiro Yamadaifdef CONFIG_LTO_CLANG 275d45950dSMasahiro Yamadainitcalls-lds := .tmp_initcalls.lds 285d45950dSMasahiro Yamadaendif 295d45950dSMasahiro Yamada 30b42d2306SMasahiro Yamada# objtool for vmlinux.o 31b42d2306SMasahiro Yamada# --------------------------------------------------------------------------- 32b42d2306SMasahiro Yamada# 334759670bSJosh Poimboeuf# For delay-objtool (IBT or LTO), objtool doesn't run on individual translation 344759670bSJosh Poimboeuf# units. Instead it runs on vmlinux.o. 354759670bSJosh Poimboeuf# 364759670bSJosh Poimboeuf# For !delay-objtool + CONFIG_NOINSTR_VALIDATION, it runs on both translation 374759670bSJosh Poimboeuf# units and vmlinux.o, with the latter only used for noinstr/unret validation. 38b42d2306SMasahiro Yamada 39b42d2306SMasahiro Yamadaobjtool-enabled := $(or $(delay-objtool),$(CONFIG_NOINSTR_VALIDATION)) 40b42d2306SMasahiro Yamada 414759670bSJosh Poimboeufifeq ($(delay-objtool),y) 424759670bSJosh Poimboeufvmlinux-objtool-args-y += $(objtool-args-y) 434759670bSJosh Poimboeufelse 444759670bSJosh Poimboeufvmlinux-objtool-args-$(CONFIG_OBJTOOL_WERROR) += --Werror 454759670bSJosh Poimboeufendif 464759670bSJosh Poimboeuf 47eeb9f34dSJosh Poimboeufvmlinux-objtool-args-$(CONFIG_NOINSTR_VALIDATION) += --noinstr \ 48a033eec9SBreno Leitao $(if $(or $(CONFIG_MITIGATION_UNRET_ENTRY),$(CONFIG_MITIGATION_SRSO)), --unret) 49b42d2306SMasahiro Yamada 509ec6ab6eSMasahiro Yamadaobjtool-args = $(vmlinux-objtool-args-y) --link 51b42d2306SMasahiro Yamada 525d45950dSMasahiro Yamada# Link of vmlinux.o used for section mismatch analysis 535d45950dSMasahiro Yamada# --------------------------------------------------------------------------- 545d45950dSMasahiro Yamada 555f5e7344SKris Van Heesvmlinux-o-ld-args-$(CONFIG_BUILTIN_MODULE_RANGES) += -Map=$@.map 565f5e7344SKris Van Hees 575d45950dSMasahiro Yamadaquiet_cmd_ld_vmlinux.o = LD $@ 585d45950dSMasahiro Yamada cmd_ld_vmlinux.o = \ 595d45950dSMasahiro Yamada $(LD) ${KBUILD_LDFLAGS} -r -o $@ \ 605f5e7344SKris Van Hees $(vmlinux-o-ld-args-y) \ 615d45950dSMasahiro Yamada $(addprefix -T , $(initcalls-lds)) \ 6232164845SMasahiro Yamada --whole-archive vmlinux.a --no-whole-archive \ 635d45950dSMasahiro Yamada --start-group $(KBUILD_VMLINUX_LIBS) --end-group \ 64b42d2306SMasahiro Yamada $(cmd_objtool) 655d45950dSMasahiro Yamada 665d45950dSMasahiro Yamadadefine rule_ld_vmlinux.o 675d45950dSMasahiro Yamada $(call cmd_and_savecmd,ld_vmlinux.o) 68b42d2306SMasahiro Yamada $(call cmd,gen_objtooldep) 695d45950dSMasahiro Yamadaendef 705d45950dSMasahiro Yamada 7132164845SMasahiro Yamadavmlinux.o: $(initcalls-lds) vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE 725d45950dSMasahiro Yamada $(call if_changed_rule,ld_vmlinux.o) 735d45950dSMasahiro Yamada 745d45950dSMasahiro Yamadatargets += vmlinux.o 755d45950dSMasahiro Yamada 768fb4ac1cSMasahiro Yamada# Add FORCE to the prerequisites of a target to force it to be always rebuilt. 775d45950dSMasahiro Yamada# --------------------------------------------------------------------------- 785d45950dSMasahiro Yamada 795d45950dSMasahiro YamadaPHONY += FORCE 805d45950dSMasahiro YamadaFORCE: 815d45950dSMasahiro Yamada 825d45950dSMasahiro Yamada# Read all saved command lines and dependencies for the $(targets) we 835d45950dSMasahiro Yamada# may be building above, using $(if_changed{,_dep}). As an 845d45950dSMasahiro Yamada# optimization, we don't need to read them if the target does not 855d45950dSMasahiro Yamada# exist, we will rebuild anyway in that case. 865d45950dSMasahiro Yamada 875d45950dSMasahiro Yamadaexisting-targets := $(wildcard $(sort $(targets))) 885d45950dSMasahiro Yamada 895d45950dSMasahiro Yamada-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 905d45950dSMasahiro Yamada 915d45950dSMasahiro Yamada.PHONY: $(PHONY) 92