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 20# Sanitizer runtimes are unavailable and cannot be linked for early boot code. 21KASAN_SANITIZE := n 22KCSAN_SANITIZE := n 23KMSAN_SANITIZE := n 24OBJECT_FILES_NON_STANDARD := y 25 26# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in. 27KCOV_INSTRUMENT := n 28 29targets := vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma \ 30 vmlinux.bin.xz vmlinux.bin.lzo vmlinux.bin.lz4 vmlinux.bin.zst 31 32# CLANG_FLAGS must come before any cc-disable-warning or cc-option calls in 33# case of cross compiling, as it has the '--target=' flag, which is needed to 34# avoid errors with '-march=i386', and future flags may depend on the target to 35# be valid. 36KBUILD_CFLAGS := -m$(BITS) -O2 $(CLANG_FLAGS) 37KBUILD_CFLAGS += -fno-strict-aliasing -fPIE 38KBUILD_CFLAGS += -Wundef 39KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING 40cflags-$(CONFIG_X86_32) := -march=i386 41cflags-$(CONFIG_X86_64) := -mcmodel=small -mno-red-zone 42KBUILD_CFLAGS += $(cflags-y) 43KBUILD_CFLAGS += -mno-mmx -mno-sse 44KBUILD_CFLAGS += -ffreestanding -fshort-wchar 45KBUILD_CFLAGS += -fno-stack-protector 46KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 47KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 48KBUILD_CFLAGS += -Wno-pointer-sign 49KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 50KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 51KBUILD_CFLAGS += -D__DISABLE_EXPORTS 52# Disable relocation relaxation in case the link is not PIE. 53KBUILD_CFLAGS += $(call cc-option,-Wa$(comma)-mrelax-relocations=no) 54KBUILD_CFLAGS += -include $(srctree)/include/linux/hidden.h 55 56# sev.c indirectly inludes inat-table.h which is generated during 57# compilation and stored in $(objtree). Add the directory to the includes so 58# that the compiler finds it even with out-of-tree builds (make O=/some/path). 59CFLAGS_sev.o += -I$(objtree)/arch/x86/lib/ 60 61KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__ 62GCOV_PROFILE := n 63UBSAN_SANITIZE :=n 64 65KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE) 66KBUILD_LDFLAGS += $(call ld-option,--no-ld-generated-unwind-info) 67# Compressed kernel should be built as PIE since it may be loaded at any 68# address by the bootloader. 69LDFLAGS_vmlinux := -pie $(call ld-option, --no-dynamic-linker) 70ifdef CONFIG_LD_ORPHAN_WARN 71LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 72endif 73LDFLAGS_vmlinux += -z noexecstack 74ifeq ($(CONFIG_LD_IS_BFD),y) 75LDFLAGS_vmlinux += $(call ld-option,--no-warn-rwx-segments) 76endif 77ifeq ($(CONFIG_EFI_STUB),y) 78# ensure that the static EFI stub library will be pulled in, even if it is 79# never referenced explicitly from the startup code 80LDFLAGS_vmlinux += -u efi_pe_entry 81endif 82LDFLAGS_vmlinux += -T 83 84hostprogs := mkpiggy 85HOST_EXTRACFLAGS += -I$(srctree)/tools/include 86 87sed-voffset := -e 's/^\([0-9a-fA-F]*\) [ABCDGRSTVW] \(_text\|__bss_start\|_end\)$$/\#define VO_\2 _AC(0x\1,UL)/p' 88 89quiet_cmd_voffset = VOFFSET $@ 90 cmd_voffset = $(NM) $< | sed -n $(sed-voffset) > $@ 91 92targets += ../voffset.h 93 94$(obj)/../voffset.h: vmlinux FORCE 95 $(call if_changed,voffset) 96 97$(obj)/misc.o: $(obj)/../voffset.h 98 99vmlinux-objs-y := $(obj)/vmlinux.lds $(obj)/kernel_info.o $(obj)/head_$(BITS).o \ 100 $(obj)/misc.o $(obj)/string.o $(obj)/cmdline.o $(obj)/error.o \ 101 $(obj)/piggy.o $(obj)/cpuflags.o 102 103vmlinux-objs-$(CONFIG_EARLY_PRINTK) += $(obj)/early_serial_console.o 104vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/kaslr.o 105ifdef CONFIG_X86_64 106 vmlinux-objs-y += $(obj)/ident_map_64.o 107 vmlinux-objs-y += $(obj)/idt_64.o $(obj)/idt_handlers_64.o 108 vmlinux-objs-$(CONFIG_AMD_MEM_ENCRYPT) += $(obj)/mem_encrypt.o 109 vmlinux-objs-y += $(obj)/pgtable_64.o 110 vmlinux-objs-$(CONFIG_AMD_MEM_ENCRYPT) += $(obj)/sev.o 111endif 112 113vmlinux-objs-$(CONFIG_ACPI) += $(obj)/acpi.o 114vmlinux-objs-$(CONFIG_INTEL_TDX_GUEST) += $(obj)/tdx.o $(obj)/tdcall.o $(obj)/tdx-shared.o 115vmlinux-objs-$(CONFIG_UNACCEPTED_MEMORY) += $(obj)/mem.o 116 117vmlinux-objs-$(CONFIG_EFI) += $(obj)/efi.o 118vmlinux-objs-$(CONFIG_EFI_MIXED) += $(obj)/efi_mixed.o 119vmlinux-objs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 120 121$(obj)/vmlinux: $(vmlinux-objs-y) FORCE 122 $(call if_changed,ld) 123 124OBJCOPYFLAGS_vmlinux.bin := -R .comment -S 125$(obj)/vmlinux.bin: vmlinux FORCE 126 $(call if_changed,objcopy) 127 128targets += $(patsubst $(obj)/%,%,$(vmlinux-objs-y)) vmlinux.bin.all vmlinux.relocs 129 130# vmlinux.relocs is created by the vmlinux postlink step. 131$(obj)/vmlinux.relocs: vmlinux 132 @true 133 134vmlinux.bin.all-y := $(obj)/vmlinux.bin 135vmlinux.bin.all-$(CONFIG_X86_NEED_RELOCS) += $(obj)/vmlinux.relocs 136 137$(obj)/vmlinux.bin.gz: $(vmlinux.bin.all-y) FORCE 138 $(call if_changed,gzip) 139$(obj)/vmlinux.bin.bz2: $(vmlinux.bin.all-y) FORCE 140 $(call if_changed,bzip2_with_size) 141$(obj)/vmlinux.bin.lzma: $(vmlinux.bin.all-y) FORCE 142 $(call if_changed,lzma_with_size) 143$(obj)/vmlinux.bin.xz: $(vmlinux.bin.all-y) FORCE 144 $(call if_changed,xzkern_with_size) 145$(obj)/vmlinux.bin.lzo: $(vmlinux.bin.all-y) FORCE 146 $(call if_changed,lzo_with_size) 147$(obj)/vmlinux.bin.lz4: $(vmlinux.bin.all-y) FORCE 148 $(call if_changed,lz4_with_size) 149$(obj)/vmlinux.bin.zst: $(vmlinux.bin.all-y) FORCE 150 $(call if_changed,zstd22_with_size) 151 152suffix-$(CONFIG_KERNEL_GZIP) := gz 153suffix-$(CONFIG_KERNEL_BZIP2) := bz2 154suffix-$(CONFIG_KERNEL_LZMA) := lzma 155suffix-$(CONFIG_KERNEL_XZ) := xz 156suffix-$(CONFIG_KERNEL_LZO) := lzo 157suffix-$(CONFIG_KERNEL_LZ4) := lz4 158suffix-$(CONFIG_KERNEL_ZSTD) := zst 159 160quiet_cmd_mkpiggy = MKPIGGY $@ 161 cmd_mkpiggy = $(obj)/mkpiggy $< > $@ 162 163targets += piggy.S 164$(obj)/piggy.S: $(obj)/vmlinux.bin.$(suffix-y) $(obj)/mkpiggy FORCE 165 $(call if_changed,mkpiggy) 166