1# SPDX-License-Identifier: GPL-2.0-only 2 3PHONY := __default 4__default: vmlinux 5 6include include/config/auto.conf 7include $(srctree)/scripts/Kbuild.include 8include $(srctree)/scripts/Makefile.lib 9 10targets := 11 12%.o: %.c FORCE 13 $(call if_changed_rule,cc_o_c) 14 15%.o: %.S FORCE 16 $(call if_changed_rule,as_o_S) 17 18# Built-in dtb 19# --------------------------------------------------------------------------- 20 21quiet_cmd_wrap_dtbs = WRAP $@ 22 cmd_wrap_dtbs = { \ 23 echo '\#include <asm-generic/vmlinux.lds.h>'; \ 24 echo '.section .dtb.init.rodata,"a"'; \ 25 while read dtb; do \ 26 symbase=__dtb_$$(basename -s .dtb "$${dtb}" | tr - _); \ 27 echo '.balign STRUCT_ALIGNMENT'; \ 28 echo ".global $${symbase}_begin"; \ 29 echo "$${symbase}_begin:"; \ 30 echo '.incbin "'$$dtb'" '; \ 31 echo ".global $${symbase}_end"; \ 32 echo "$${symbase}_end:"; \ 33 done < $<; \ 34 } > $@ 35 36.builtin-dtbs.S: .builtin-dtbs-list FORCE 37 $(call if_changed,wrap_dtbs) 38 39quiet_cmd_gen_dtbs_list = GEN $@ 40 cmd_gen_dtbs_list = \ 41 $(if $(CONFIG_BUILTIN_DTB_NAME), echo "arch/$(SRCARCH)/boot/dts/$(CONFIG_BUILTIN_DTB_NAME).dtb",:) > $@ 42 43.builtin-dtbs-list: arch/$(SRCARCH)/boot/dts/dtbs-list FORCE 44 $(call if_changed,$(if $(CONFIG_BUILTIN_DTB_ALL),copy,gen_dtbs_list)) 45 46targets += .builtin-dtbs-list 47 48ifdef CONFIG_GENERIC_BUILTIN_DTB 49targets += .builtin-dtbs.S .builtin-dtbs.o 50vmlinux.unstripped: .builtin-dtbs.o 51endif 52 53# vmlinux.unstripped 54# --------------------------------------------------------------------------- 55 56ifdef CONFIG_MODULES 57targets += .vmlinux.export.o 58vmlinux.unstripped: .vmlinux.export.o 59endif 60 61ifdef CONFIG_ARCH_WANTS_PRE_LINK_VMLINUX 62vmlinux.unstripped: arch/$(SRCARCH)/tools/vmlinux.arch.o 63 64arch/$(SRCARCH)/tools/vmlinux.arch.o: vmlinux.o FORCE 65 $(Q)$(MAKE) $(build)=arch/$(SRCARCH)/tools $@ 66endif 67 68ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 69 70# Final link of vmlinux with optional arch pass after final link 71cmd_link_vmlinux = \ 72 $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)" "$@"; \ 73 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 74 75targets += vmlinux.unstripped 76vmlinux.unstripped: scripts/link-vmlinux.sh vmlinux.o $(KBUILD_LDS) FORCE 77 +$(call if_changed_dep,link_vmlinux) 78ifdef CONFIG_DEBUG_INFO_BTF 79vmlinux.unstripped: $(RESOLVE_BTFIDS) 80endif 81 82ifdef CONFIG_BUILDTIME_TABLE_SORT 83vmlinux.unstripped: scripts/sorttable 84endif 85 86# vmlinux 87# --------------------------------------------------------------------------- 88 89remove-section-y := .modinfo 90remove-section-$(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS) += '.rel*' 91 92# To avoid warnings: "empty loadable segment detected at ..." from GNU objcopy, 93# it is necessary to remove the PT_LOAD flag from the segment. 94quiet_cmd_strip_relocs = OBJCOPY $@ 95 cmd_strip_relocs = $(OBJCOPY) $(patsubst %,--set-section-flags %=noload,$(remove-section-y)) $< $@; \ 96 $(OBJCOPY) $(addprefix --remove-section=,$(remove-section-y)) $@ 97 98targets += vmlinux 99vmlinux: vmlinux.unstripped FORCE 100 $(call if_changed,strip_relocs) 101 102# modules.builtin.ranges 103# --------------------------------------------------------------------------- 104ifdef CONFIG_BUILTIN_MODULE_RANGES 105__default: modules.builtin.ranges 106 107quiet_cmd_modules_builtin_ranges = GEN $@ 108 cmd_modules_builtin_ranges = gawk -f $(real-prereqs) > $@ 109 110targets += modules.builtin.ranges 111modules.builtin.ranges: $(srctree)/scripts/generate_builtin_ranges.awk \ 112 modules.builtin vmlinux.map vmlinux.o.map FORCE 113 $(call if_changed,modules_builtin_ranges) 114 115vmlinux.map: vmlinux.unstripped 116 @: 117 118endif 119 120# Add FORCE to the prerequisites of a target to force it to be always rebuilt. 121# --------------------------------------------------------------------------- 122 123PHONY += FORCE 124FORCE: 125 126# Read all saved command lines and dependencies for the $(targets) we 127# may be building above, using $(if_changed{,_dep}). As an 128# optimization, we don't need to read them if the target does not 129# exist, we will rebuild anyway in that case. 130 131existing-targets := $(wildcard $(sort $(targets))) 132 133-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 134 135.PHONY: $(PHONY) 136