15d45950dSMasahiro Yamada# SPDX-License-Identifier: GPL-2.0-only 25d45950dSMasahiro Yamada 35d45950dSMasahiro YamadaPHONY := __default 47a342e6cSMasahiro 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# 33b42d2306SMasahiro Yamada# For delay-objtool (IBT or LTO), objtool doesn't run on individual translation 34b42d2306SMasahiro Yamada# units. Instead it runs on vmlinux.o. 35b42d2306SMasahiro Yamada# 36b42d2306SMasahiro Yamada# For !delay-objtool + CONFIG_NOINSTR_VALIDATION, it runs on both translation 37b42d2306SMasahiro Yamada# units and vmlinux.o, with the latter only used for noinstr/unret validation. 389ec6ab6eSMasahiro Yamada 399ec6ab6eSMasahiro Yamadaobjtool-enabled := $(or $(delay-objtool),$(CONFIG_NOINSTR_VALIDATION)) 40eeb9f34dSJosh Poimboeuf 41a033eec9SBreno Leitaoifeq ($(delay-objtool),y) 42b42d2306SMasahiro Yamadavmlinux-objtool-args-y += $(objtool-args-y) 439ec6ab6eSMasahiro Yamadaelse 44b42d2306SMasahiro Yamadavmlinux-objtool-args-$(CONFIG_OBJTOOL_WERROR) += --Werror 455d45950dSMasahiro Yamadaendif 465d45950dSMasahiro Yamada 475d45950dSMasahiro Yamadavmlinux-objtool-args-$(CONFIG_NOINSTR_VALIDATION) += --noinstr \ 48*5f5e7344SKris Van Hees $(if $(or $(CONFIG_MITIGATION_UNRET_ENTRY),$(CONFIG_MITIGATION_SRSO)), --unret) 49*5f5e7344SKris Van Hees 505d45950dSMasahiro Yamadaobjtool-args = $(vmlinux-objtool-args-y) --link 515d45950dSMasahiro Yamada 525d45950dSMasahiro Yamada# Link of vmlinux.o used for section mismatch analysis 53*5f5e7344SKris Van Hees# --------------------------------------------------------------------------- 545d45950dSMasahiro Yamada 5532164845SMasahiro Yamadavmlinux-o-ld-args-$(CONFIG_BUILTIN_MODULE_RANGES) += -Map=$@.map 565d45950dSMasahiro Yamada 57b42d2306SMasahiro Yamadaquiet_cmd_ld_vmlinux.o = LD $@ 585d45950dSMasahiro Yamada cmd_ld_vmlinux.o = \ 595d45950dSMasahiro Yamada $(LD) ${KBUILD_LDFLAGS} -r -o $@ \ 605d45950dSMasahiro Yamada $(vmlinux-o-ld-args-y) \ 61b42d2306SMasahiro Yamada $(addprefix -T , $(initcalls-lds)) \ 625d45950dSMasahiro Yamada --whole-archive vmlinux.a --no-whole-archive \ 635d45950dSMasahiro Yamada --start-group $(KBUILD_VMLINUX_LIBS) --end-group \ 6432164845SMasahiro Yamada $(cmd_objtool) 655d45950dSMasahiro Yamada 665d45950dSMasahiro Yamadadefine rule_ld_vmlinux.o 675d45950dSMasahiro Yamada $(call cmd_and_savecmd,ld_vmlinux.o) 685d45950dSMasahiro Yamada $(call cmd,gen_objtooldep) 697a342e6cSMasahiro Yamadaendef 707a342e6cSMasahiro Yamada 717a342e6cSMasahiro Yamadavmlinux.o: $(initcalls-lds) vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE 727a342e6cSMasahiro Yamada $(call if_changed_rule,ld_vmlinux.o) 737a342e6cSMasahiro Yamada 747a342e6cSMasahiro Yamadatargets += vmlinux.o 757a342e6cSMasahiro Yamada 767a342e6cSMasahiro Yamada# Add FORCE to the prerequisites of a target to force it to be always rebuilt. 777a342e6cSMasahiro Yamada# --------------------------------------------------------------------------- 787a342e6cSMasahiro Yamada 797a342e6cSMasahiro YamadaPHONY += FORCE 807a342e6cSMasahiro YamadaFORCE: 817a342e6cSMasahiro Yamada 827a342e6cSMasahiro Yamada# Read all saved command lines and dependencies for the $(targets) we 837a342e6cSMasahiro Yamada# may be building above, using $(if_changed{,_dep}). As an 847a342e6cSMasahiro Yamada# optimization, we don't need to read them if the target does not 857a342e6cSMasahiro Yamada# exist, we will rebuild anyway in that case. 867a342e6cSMasahiro Yamada 877a342e6cSMasahiro Yamadaexisting-targets := $(wildcard $(sort $(targets))) 887a342e6cSMasahiro Yamada 897a342e6cSMasahiro Yamada-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 907a342e6cSMasahiro Yamada 917a342e6cSMasahiro Yamada.PHONY: $(PHONY) 927a342e6cSMasahiro Yamada