1# 2# linux/arch/x86/boot/compressed/Makefile 3# 4# create a compressed vmlinux image from the original vmlinux 5# 6 7KASAN_SANITIZE := n 8 9# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in. 10KCOV_INSTRUMENT := n 11 12targets := vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma \ 13 vmlinux.bin.xz vmlinux.bin.lzo vmlinux.bin.lz4 14 15KBUILD_CFLAGS := -m$(BITS) -D__KERNEL__ $(LINUX_INCLUDE) -O2 16KBUILD_CFLAGS += -fno-strict-aliasing $(call cc-option, -fPIE, -fPIC) 17KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING 18cflags-$(CONFIG_X86_32) := -march=i386 19cflags-$(CONFIG_X86_64) := -mcmodel=small 20KBUILD_CFLAGS += $(cflags-y) 21KBUILD_CFLAGS += -mno-mmx -mno-sse 22KBUILD_CFLAGS += $(call cc-option,-ffreestanding) 23KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector) 24 25KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__ 26GCOV_PROFILE := n 27 28LDFLAGS := -m elf_$(UTS_MACHINE) 29ifeq ($(CONFIG_RELOCATABLE),y) 30# If kernel is relocatable, build compressed kernel as PIE. 31ifeq ($(CONFIG_X86_32),y) 32LDFLAGS += $(call ld-option, -pie) $(call ld-option, --no-dynamic-linker) 33else 34# To build 64-bit compressed kernel as PIE, we disable relocation 35# overflow check to avoid relocation overflow error with a new linker 36# command-line option, -z noreloc-overflow. 37LDFLAGS += $(shell $(LD) --help 2>&1 | grep -q "\-z noreloc-overflow" \ 38 && echo "-z noreloc-overflow -pie --no-dynamic-linker") 39endif 40endif 41LDFLAGS_vmlinux := -T 42 43hostprogs-y := mkpiggy 44HOST_EXTRACFLAGS += -I$(srctree)/tools/include 45 46vmlinux-objs-y := $(obj)/vmlinux.lds $(obj)/head_$(BITS).o $(obj)/misc.o \ 47 $(obj)/string.o $(obj)/cmdline.o \ 48 $(obj)/piggy.o $(obj)/cpuflags.o 49 50vmlinux-objs-$(CONFIG_EARLY_PRINTK) += $(obj)/early_serial_console.o 51vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/aslr.o 52 53$(obj)/eboot.o: KBUILD_CFLAGS += -fshort-wchar -mno-red-zone 54 55vmlinux-objs-$(CONFIG_EFI_STUB) += $(obj)/eboot.o $(obj)/efi_stub_$(BITS).o 56vmlinux-objs-$(CONFIG_EFI_MIXED) += $(obj)/efi_thunk_$(BITS).o 57 58$(obj)/vmlinux: $(vmlinux-objs-y) FORCE 59 $(call if_changed,ld) 60 @: 61 62OBJCOPYFLAGS_vmlinux.bin := -R .comment -S 63$(obj)/vmlinux.bin: vmlinux FORCE 64 $(call if_changed,objcopy) 65 66targets += $(patsubst $(obj)/%,%,$(vmlinux-objs-y)) vmlinux.bin.all vmlinux.relocs 67 68CMD_RELOCS = arch/x86/tools/relocs 69quiet_cmd_relocs = RELOCS $@ 70 cmd_relocs = $(CMD_RELOCS) $< > $@;$(CMD_RELOCS) --abs-relocs $< 71$(obj)/vmlinux.relocs: vmlinux FORCE 72 $(call if_changed,relocs) 73 74vmlinux.bin.all-y := $(obj)/vmlinux.bin 75vmlinux.bin.all-$(CONFIG_X86_NEED_RELOCS) += $(obj)/vmlinux.relocs 76 77$(obj)/vmlinux.bin.gz: $(vmlinux.bin.all-y) FORCE 78 $(call if_changed,gzip) 79$(obj)/vmlinux.bin.bz2: $(vmlinux.bin.all-y) FORCE 80 $(call if_changed,bzip2) 81$(obj)/vmlinux.bin.lzma: $(vmlinux.bin.all-y) FORCE 82 $(call if_changed,lzma) 83$(obj)/vmlinux.bin.xz: $(vmlinux.bin.all-y) FORCE 84 $(call if_changed,xzkern) 85$(obj)/vmlinux.bin.lzo: $(vmlinux.bin.all-y) FORCE 86 $(call if_changed,lzo) 87$(obj)/vmlinux.bin.lz4: $(vmlinux.bin.all-y) FORCE 88 $(call if_changed,lz4) 89 90suffix-$(CONFIG_KERNEL_GZIP) := gz 91suffix-$(CONFIG_KERNEL_BZIP2) := bz2 92suffix-$(CONFIG_KERNEL_LZMA) := lzma 93suffix-$(CONFIG_KERNEL_XZ) := xz 94suffix-$(CONFIG_KERNEL_LZO) := lzo 95suffix-$(CONFIG_KERNEL_LZ4) := lz4 96 97RUN_SIZE = $(shell $(OBJDUMP) -h vmlinux | \ 98 $(CONFIG_SHELL) $(srctree)/arch/x86/tools/calc_run_size.sh) 99quiet_cmd_mkpiggy = MKPIGGY $@ 100 cmd_mkpiggy = $(obj)/mkpiggy $< $(RUN_SIZE) > $@ || ( rm -f $@ ; false ) 101 102targets += piggy.S 103$(obj)/piggy.S: $(obj)/vmlinux.bin.$(suffix-y) $(obj)/mkpiggy FORCE 104 $(call if_changed,mkpiggy) 105