15d45950dSMasahiro Yamada# SPDX-License-Identifier: GPL-2.0-only 25d45950dSMasahiro Yamada 35d45950dSMasahiro YamadaPHONY := __default 45d45950dSMasahiro Yamada__default: vmlinux.o 55d45950dSMasahiro Yamada 65d45950dSMasahiro Yamadainclude include/config/auto.conf 75d45950dSMasahiro Yamadainclude $(srctree)/scripts/Kbuild.include 85d45950dSMasahiro Yamada 9*b42d2306SMasahiro Yamada# for objtool 10*b42d2306SMasahiro Yamadainclude $(srctree)/scripts/Makefile.lib 11*b42d2306SMasahiro 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 \ 215d45950dSMasahiro Yamada $(KBUILD_VMLINUX_OBJS) $(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 30*b42d2306SMasahiro Yamada# objtool for vmlinux.o 31*b42d2306SMasahiro Yamada# --------------------------------------------------------------------------- 32*b42d2306SMasahiro Yamada# 33*b42d2306SMasahiro Yamada# For LTO and IBT, objtool doesn't run on individual translation units. 34*b42d2306SMasahiro Yamada# Run everything on vmlinux instead. 35*b42d2306SMasahiro Yamada 36*b42d2306SMasahiro Yamadaobjtool-enabled := $(or $(delay-objtool),$(CONFIG_NOINSTR_VALIDATION)) 37*b42d2306SMasahiro Yamada 38*b42d2306SMasahiro Yamada# Reuse objtool_args defined in scripts/Makefile.lib if LTO or IBT is enabled. 39*b42d2306SMasahiro Yamada# 40*b42d2306SMasahiro Yamada# Add some more flags as needed. 41*b42d2306SMasahiro Yamada# --no-unreachable and --link might be added twice, but it is fine. 42*b42d2306SMasahiro Yamada# 43*b42d2306SMasahiro Yamada# Expand objtool_args to a simple variable to avoid circular reference. 44*b42d2306SMasahiro Yamada 45*b42d2306SMasahiro Yamadaobjtool_args := \ 46*b42d2306SMasahiro Yamada $(if $(delay-objtool),$(objtool_args)) \ 47*b42d2306SMasahiro Yamada $(if $(CONFIG_NOINSTR_VALIDATION), --noinstr) \ 48*b42d2306SMasahiro Yamada $(if $(CONFIG_GCOV_KERNEL), --no-unreachable) \ 49*b42d2306SMasahiro Yamada --link 50*b42d2306SMasahiro Yamada 515d45950dSMasahiro Yamada# Link of vmlinux.o used for section mismatch analysis 525d45950dSMasahiro Yamada# --------------------------------------------------------------------------- 535d45950dSMasahiro Yamada 545d45950dSMasahiro Yamadaquiet_cmd_ld_vmlinux.o = LD $@ 555d45950dSMasahiro Yamada cmd_ld_vmlinux.o = \ 565d45950dSMasahiro Yamada $(LD) ${KBUILD_LDFLAGS} -r -o $@ \ 575d45950dSMasahiro Yamada $(addprefix -T , $(initcalls-lds)) \ 585d45950dSMasahiro Yamada --whole-archive $(KBUILD_VMLINUX_OBJS) --no-whole-archive \ 595d45950dSMasahiro Yamada --start-group $(KBUILD_VMLINUX_LIBS) --end-group \ 60*b42d2306SMasahiro Yamada $(cmd_objtool) 615d45950dSMasahiro Yamada 625d45950dSMasahiro Yamadadefine rule_ld_vmlinux.o 635d45950dSMasahiro Yamada $(call cmd_and_savecmd,ld_vmlinux.o) 64*b42d2306SMasahiro Yamada $(call cmd,gen_objtooldep) 655d45950dSMasahiro Yamadaendef 665d45950dSMasahiro Yamada 675d45950dSMasahiro Yamadavmlinux.o: $(initcalls-lds) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) FORCE 685d45950dSMasahiro Yamada $(call if_changed_rule,ld_vmlinux.o) 695d45950dSMasahiro Yamada 705d45950dSMasahiro Yamadatargets += vmlinux.o 715d45950dSMasahiro Yamada 725d45950dSMasahiro Yamada# Add FORCE to the prequisites of a target to force it to be always rebuilt. 735d45950dSMasahiro Yamada# --------------------------------------------------------------------------- 745d45950dSMasahiro Yamada 755d45950dSMasahiro YamadaPHONY += FORCE 765d45950dSMasahiro YamadaFORCE: 775d45950dSMasahiro Yamada 785d45950dSMasahiro Yamada# Read all saved command lines and dependencies for the $(targets) we 795d45950dSMasahiro Yamada# may be building above, using $(if_changed{,_dep}). As an 805d45950dSMasahiro Yamada# optimization, we don't need to read them if the target does not 815d45950dSMasahiro Yamada# exist, we will rebuild anyway in that case. 825d45950dSMasahiro Yamada 835d45950dSMasahiro Yamadaexisting-targets := $(wildcard $(sort $(targets))) 845d45950dSMasahiro Yamada 855d45950dSMasahiro Yamada-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 865d45950dSMasahiro Yamada 875d45950dSMasahiro Yamada.PHONY: $(PHONY) 88