1# SPDX-License-Identifier: GPL-2.0 2# 3# linux/arch/x86/boot/compressed/Makefile 4# 5# create a compressed vmlinux image from the original vmlinux 6# 7# vmlinuz is: 8# decompression code (*.o) 9# asm globals (piggy.S), including: 10# vmlinux.bin.(gz|bz2|lzma|...) 11# 12# vmlinux.bin is: 13# vmlinux stripped of debugging and comments 14# vmlinux.bin.all is: 15# vmlinux.bin + vmlinux.relocs 16# vmlinux.bin.(gz|bz2|lzma|...) is: 17# (see scripts/Makefile.lib size_append) 18# compressed vmlinux.bin.all + u32 size of vmlinux.bin.all 19 20targets := vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma \ 21 vmlinux.bin.xz vmlinux.bin.lzo vmlinux.bin.lz4 vmlinux.bin.zst 22 23# CLANG_FLAGS must come before any cc-disable-warning or cc-option calls in 24# case of cross compiling, as it has the '--target=' flag, which is needed to 25# avoid errors with '-march=i386', and future flags may depend on the target to 26# be valid. 27KBUILD_CFLAGS := -m$(BITS) -O2 $(CLANG_FLAGS) 28KBUILD_CFLAGS += -fno-strict-aliasing -fPIE 29KBUILD_CFLAGS += -Wundef 30KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING 31cflags-$(CONFIG_X86_32) := -march=i386 32cflags-$(CONFIG_X86_64) := -mcmodel=small -mno-red-zone 33KBUILD_CFLAGS += $(cflags-y) 34KBUILD_CFLAGS += -mno-mmx -mno-sse 35KBUILD_CFLAGS += -ffreestanding -fshort-wchar 36KBUILD_CFLAGS += -fno-stack-protector 37KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 38KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 39KBUILD_CFLAGS += -Wno-pointer-sign 40KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 41KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 42KBUILD_CFLAGS += -D__DISABLE_EXPORTS 43# Disable relocation relaxation in case the link is not PIE. 44KBUILD_CFLAGS += $(call cc-option,-Wa$(comma)-mrelax-relocations=no) 45KBUILD_CFLAGS += -include $(srctree)/include/linux/hidden.h 46 47# sev.c indirectly includes inat-table.h which is generated during 48# compilation and stored in $(objtree). Add the directory to the includes so 49# that the compiler finds it even with out-of-tree builds (make O=/some/path). 50CFLAGS_sev.o += -I$(objtree)/arch/x86/lib/ 51 52KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__ 53 54KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE) 55KBUILD_LDFLAGS += $(call ld-option,--no-ld-generated-unwind-info) 56# Compressed kernel should be built as PIE since it may be loaded at any 57# address by the bootloader. 58LDFLAGS_vmlinux := -pie $(call ld-option, --no-dynamic-linker) 59ifdef CONFIG_LD_ORPHAN_WARN 60LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 61endif 62LDFLAGS_vmlinux += -z noexecstack 63ifeq ($(CONFIG_LD_IS_BFD),y) 64LDFLAGS_vmlinux += $(call ld-option,--no-warn-rwx-segments) 65endif 66ifeq ($(CONFIG_EFI_STUB),y) 67# ensure that the static EFI stub library will be pulled in, even if it is 68# never referenced explicitly from the startup code 69LDFLAGS_vmlinux += -u efi_pe_entry 70endif 71LDFLAGS_vmlinux += -T 72 73hostprogs := mkpiggy 74HOST_EXTRACFLAGS += -I$(srctree)/tools/include 75 76sed-voffset := -e 's/^\([0-9a-fA-F]*\) [ABCDGRSTVW] \(_text\|__start_rodata\|__bss_start\|_end\)$$/\#define VO_\2 _AC(0x\1,UL)/p' 77 78quiet_cmd_voffset = VOFFSET $@ 79 cmd_voffset = $(NM) $< | sed -n $(sed-voffset) > $@ 80 81targets += ../voffset.h 82 83$(obj)/../voffset.h: vmlinux FORCE 84 $(call if_changed,voffset) 85 86$(obj)/misc.o: $(obj)/../voffset.h 87 88vmlinux-objs-y := $(obj)/vmlinux.lds $(obj)/kernel_info.o $(obj)/head_$(BITS).o \ 89 $(obj)/misc.o $(obj)/string.o $(obj)/cmdline.o $(obj)/error.o \ 90 $(obj)/piggy.o $(obj)/cpuflags.o 91 92vmlinux-objs-$(CONFIG_EARLY_PRINTK) += $(obj)/early_serial_console.o 93vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/kaslr.o 94ifdef CONFIG_X86_64 95 vmlinux-objs-y += $(obj)/ident_map_64.o 96 vmlinux-objs-y += $(obj)/idt_64.o $(obj)/idt_handlers_64.o 97 vmlinux-objs-$(CONFIG_AMD_MEM_ENCRYPT) += $(obj)/mem_encrypt.o 98 vmlinux-objs-y += $(obj)/pgtable_64.o 99 vmlinux-objs-$(CONFIG_AMD_MEM_ENCRYPT) += $(obj)/sev.o 100endif 101 102vmlinux-objs-$(CONFIG_ACPI) += $(obj)/acpi.o 103vmlinux-objs-$(CONFIG_INTEL_TDX_GUEST) += $(obj)/tdx.o $(obj)/tdcall.o $(obj)/tdx-shared.o 104vmlinux-objs-$(CONFIG_UNACCEPTED_MEMORY) += $(obj)/mem.o 105 106vmlinux-objs-$(CONFIG_EFI) += $(obj)/efi.o 107vmlinux-objs-$(CONFIG_EFI_MIXED) += $(obj)/efi_mixed.o 108vmlinux-libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 109 110$(obj)/vmlinux: $(vmlinux-objs-y) $(vmlinux-libs-y) FORCE 111 $(call if_changed,ld) 112 113OBJCOPYFLAGS_vmlinux.bin := -R .comment -S 114$(obj)/vmlinux.bin: vmlinux FORCE 115 $(call if_changed,objcopy) 116 117targets += $(patsubst $(obj)/%,%,$(vmlinux-objs-y)) vmlinux.bin.all vmlinux.relocs 118 119# vmlinux.relocs is created by the vmlinux postlink step. 120$(obj)/vmlinux.relocs: vmlinux 121 @true 122 123vmlinux.bin.all-y := $(obj)/vmlinux.bin 124vmlinux.bin.all-$(CONFIG_X86_NEED_RELOCS) += $(obj)/vmlinux.relocs 125 126$(obj)/vmlinux.bin.gz: $(vmlinux.bin.all-y) FORCE 127 $(call if_changed,gzip) 128$(obj)/vmlinux.bin.bz2: $(vmlinux.bin.all-y) FORCE 129 $(call if_changed,bzip2_with_size) 130$(obj)/vmlinux.bin.lzma: $(vmlinux.bin.all-y) FORCE 131 $(call if_changed,lzma_with_size) 132$(obj)/vmlinux.bin.xz: $(vmlinux.bin.all-y) FORCE 133 $(call if_changed,xzkern_with_size) 134$(obj)/vmlinux.bin.lzo: $(vmlinux.bin.all-y) FORCE 135 $(call if_changed,lzo_with_size) 136$(obj)/vmlinux.bin.lz4: $(vmlinux.bin.all-y) FORCE 137 $(call if_changed,lz4_with_size) 138$(obj)/vmlinux.bin.zst: $(vmlinux.bin.all-y) FORCE 139 $(call if_changed,zstd22_with_size) 140 141suffix-$(CONFIG_KERNEL_GZIP) := gz 142suffix-$(CONFIG_KERNEL_BZIP2) := bz2 143suffix-$(CONFIG_KERNEL_LZMA) := lzma 144suffix-$(CONFIG_KERNEL_XZ) := xz 145suffix-$(CONFIG_KERNEL_LZO) := lzo 146suffix-$(CONFIG_KERNEL_LZ4) := lz4 147suffix-$(CONFIG_KERNEL_ZSTD) := zst 148 149quiet_cmd_mkpiggy = MKPIGGY $@ 150 cmd_mkpiggy = $(obj)/mkpiggy $< > $@ 151 152targets += piggy.S 153$(obj)/piggy.S: $(obj)/vmlinux.bin.$(suffix-y) $(obj)/mkpiggy FORCE 154 $(call if_changed,mkpiggy) 155