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 delay-objtool (IBT or LTO), objtool doesn't run on individual translation 34# units. Instead it runs on vmlinux.o. 35# 36# For !delay-objtool + CONFIG_NOINSTR_VALIDATION, it runs on both translation 37# units and vmlinux.o, with the latter only used for noinstr/unret validation. 38 39objtool-enabled := $(or $(delay-objtool),$(CONFIG_NOINSTR_VALIDATION)) 40 41ifeq ($(delay-objtool),y) 42vmlinux-objtool-args-y += $(objtool-args-y) 43else 44vmlinux-objtool-args-$(CONFIG_OBJTOOL_WERROR) += --Werror 45endif 46 47vmlinux-objtool-args-$(CONFIG_GCOV_KERNEL) += --no-unreachable 48vmlinux-objtool-args-$(CONFIG_NOINSTR_VALIDATION) += --noinstr \ 49 $(if $(or $(CONFIG_MITIGATION_UNRET_ENTRY),$(CONFIG_MITIGATION_SRSO)), --unret) 50 51objtool-args = $(vmlinux-objtool-args-y) --link 52 53# Link of vmlinux.o used for section mismatch analysis 54# --------------------------------------------------------------------------- 55 56vmlinux-o-ld-args-$(CONFIG_BUILTIN_MODULE_RANGES) += -Map=$@.map 57 58quiet_cmd_ld_vmlinux.o = LD $@ 59 cmd_ld_vmlinux.o = \ 60 $(LD) ${KBUILD_LDFLAGS} -r -o $@ \ 61 $(vmlinux-o-ld-args-y) \ 62 $(addprefix -T , $(initcalls-lds)) \ 63 --whole-archive vmlinux.a --no-whole-archive \ 64 --start-group $(KBUILD_VMLINUX_LIBS) --end-group \ 65 $(cmd_objtool) 66 67define rule_ld_vmlinux.o 68 $(call cmd_and_savecmd,ld_vmlinux.o) 69 $(call cmd,gen_objtooldep) 70endef 71 72vmlinux.o: $(initcalls-lds) vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE 73 $(call if_changed_rule,ld_vmlinux.o) 74 75targets += vmlinux.o 76 77# module.builtin.modinfo 78# --------------------------------------------------------------------------- 79 80OBJCOPYFLAGS_modules.builtin.modinfo := -j .modinfo -O binary 81 82targets += modules.builtin.modinfo 83modules.builtin.modinfo: vmlinux.o FORCE 84 $(call if_changed,objcopy) 85 86# module.builtin 87# --------------------------------------------------------------------------- 88 89# The second line aids cases where multiple modules share the same object. 90 91quiet_cmd_modules_builtin = GEN $@ 92 cmd_modules_builtin = \ 93 tr '\0' '\n' < $< | \ 94 sed -n 's/^[[:alnum:]:_]*\.file=//p' | \ 95 tr ' ' '\n' | uniq | sed -e 's:^:kernel/:' -e 's/$$/.ko/' > $@ 96 97targets += modules.builtin 98modules.builtin: modules.builtin.modinfo FORCE 99 $(call if_changed,modules_builtin) 100 101# Add FORCE to the prerequisites of a target to force it to be always rebuilt. 102# --------------------------------------------------------------------------- 103 104PHONY += FORCE 105FORCE: 106 107# Read all saved command lines and dependencies for the $(targets) we 108# may be building above, using $(if_changed{,_dep}). As an 109# optimization, we don't need to read them if the target does not 110# exist, we will rebuild anyway in that case. 111 112existing-targets := $(wildcard $(sort $(targets))) 113 114-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 115 116.PHONY: $(PHONY) 117