1# 2# linux/arch/x86/boot/compressed/Makefile 3# 4# create a compressed vmlinux image from the original vmlinux 5# 6 7targets := vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma vmlinux.bin.xz vmlinux.bin.lzo 8 9KBUILD_CFLAGS := -m$(BITS) -D__KERNEL__ $(LINUX_INCLUDE) -O2 10KBUILD_CFLAGS += -fno-strict-aliasing $(call cc-option, -fPIE, -fPIC) 11KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING 12cflags-$(CONFIG_X86_32) := -march=i386 13cflags-$(CONFIG_X86_64) := -mcmodel=small 14KBUILD_CFLAGS += $(cflags-y) 15KBUILD_CFLAGS += -mno-mmx -mno-sse 16KBUILD_CFLAGS += $(call cc-option,-ffreestanding) 17KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector) 18 19KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__ 20GCOV_PROFILE := n 21 22LDFLAGS := -m elf_$(UTS_MACHINE) 23ifeq ($(CONFIG_RELOCATABLE),y) 24# If kernel is relocatable, build compressed kernel as PIE. 25ifeq ($(CONFIG_X86_32),y) 26LDFLAGS += $(call ld-option, -pie) $(call ld-option, --no-dynamic-linker) 27else 28# To build 64-bit compressed kernel as PIE, we disable relocation 29# overflow check to avoid relocation overflow error with a new linker 30# command-line option, -z noreloc-overflow. 31LDFLAGS += $(shell $(LD) --help 2>&1 | grep -q "\-z noreloc-overflow" \ 32 && echo "-z noreloc-overflow -pie --no-dynamic-linker") 33endif 34endif 35LDFLAGS_vmlinux := -T 36 37hostprogs-y := mkpiggy 38HOST_EXTRACFLAGS += -I$(srctree)/tools/include 39 40VMLINUX_OBJS = $(obj)/vmlinux.lds $(obj)/head_$(BITS).o $(obj)/misc.o \ 41 $(obj)/string.o $(obj)/cmdline.o $(obj)/early_serial_console.o \ 42 $(obj)/piggy.o 43 44$(obj)/eboot.o: KBUILD_CFLAGS += -fshort-wchar -mno-red-zone 45 46ifeq ($(CONFIG_EFI_STUB), y) 47 VMLINUX_OBJS += $(obj)/eboot.o $(obj)/efi_stub_$(BITS).o 48endif 49 50$(obj)/vmlinux: $(VMLINUX_OBJS) FORCE 51 $(call if_changed,ld) 52 @: 53 54OBJCOPYFLAGS_vmlinux.bin := -R .comment -S 55$(obj)/vmlinux.bin: vmlinux FORCE 56 $(call if_changed,objcopy) 57 58targets += $(patsubst $(obj)/%,%,$(VMLINUX_OBJS)) vmlinux.bin.all vmlinux.relocs 59 60CMD_RELOCS = arch/x86/tools/relocs 61quiet_cmd_relocs = RELOCS $@ 62 cmd_relocs = $(CMD_RELOCS) $< > $@;$(CMD_RELOCS) --abs-relocs $< 63$(obj)/vmlinux.relocs: vmlinux FORCE 64 $(call if_changed,relocs) 65 66vmlinux.bin.all-y := $(obj)/vmlinux.bin 67vmlinux.bin.all-$(CONFIG_X86_NEED_RELOCS) += $(obj)/vmlinux.relocs 68 69$(obj)/vmlinux.bin.gz: $(vmlinux.bin.all-y) FORCE 70 $(call if_changed,gzip) 71$(obj)/vmlinux.bin.bz2: $(vmlinux.bin.all-y) FORCE 72 $(call if_changed,bzip2) 73$(obj)/vmlinux.bin.lzma: $(vmlinux.bin.all-y) FORCE 74 $(call if_changed,lzma) 75$(obj)/vmlinux.bin.xz: $(vmlinux.bin.all-y) FORCE 76 $(call if_changed,xzkern) 77$(obj)/vmlinux.bin.lzo: $(vmlinux.bin.all-y) FORCE 78 $(call if_changed,lzo) 79 80suffix-$(CONFIG_KERNEL_GZIP) := gz 81suffix-$(CONFIG_KERNEL_BZIP2) := bz2 82suffix-$(CONFIG_KERNEL_LZMA) := lzma 83suffix-$(CONFIG_KERNEL_XZ) := xz 84suffix-$(CONFIG_KERNEL_LZO) := lzo 85 86quiet_cmd_mkpiggy = MKPIGGY $@ 87 cmd_mkpiggy = $(obj)/mkpiggy $< > $@ || ( rm -f $@ ; false ) 88 89targets += piggy.S 90$(obj)/piggy.S: $(obj)/vmlinux.bin.$(suffix-y) $(obj)/mkpiggy FORCE 91 $(call if_changed,mkpiggy) 92