| # SPDX-License-Identifier: GPL-2.0 |
| # |
| # linux/arch/x86/boot/compressed/Makefile |
| # |
| # create a compressed vmlinux image from the original vmlinux |
| # |
| # vmlinuz is: |
| # decompression code (*.o) |
| # asm globals (piggy.S), including: |
| # vmlinux.bin.(gz|bz2|lzma|...) |
| # |
| # vmlinux.bin is: |
| # vmlinux stripped of debugging and comments |
| # vmlinux.bin.all is: |
| # vmlinux.bin + vmlinux.relocs |
| # vmlinux.bin.(gz|bz2|lzma|...) is: |
| # (see scripts/Makefile.lib size_append) |
| # compressed vmlinux.bin.all + u32 size of vmlinux.bin.all |
| |
| KASAN_SANITIZE := n |
| OBJECT_FILES_NON_STANDARD := y |
| |
| # Prevents link failures: __sanitizer_cov_trace_pc() is not linked in. |
| KCOV_INSTRUMENT := n |
| |
| targets := vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma \ |
| vmlinux.bin.xz vmlinux.bin.lzo vmlinux.bin.lz4 |
| |
| KBUILD_CFLAGS := -m$(BITS) -D__KERNEL__ -O2 |
| KBUILD_CFLAGS += -fno-strict-aliasing $(call cc-option, -fPIE, -fPIC) |
| KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING |
| cflags-$(CONFIG_X86_32) := -march=i386 |
| cflags-$(CONFIG_X86_64) := -mcmodel=small |
| KBUILD_CFLAGS += $(cflags-y) |
| KBUILD_CFLAGS += -mno-mmx -mno-sse |
| KBUILD_CFLAGS += $(call cc-option,-ffreestanding) |
| KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector) |
| KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) |
| # Disable relocation relaxation in case the link is not PIE. |
| KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mrelax-relocations=no) |
| |
| KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__ |
| GCOV_PROFILE := n |
| UBSAN_SANITIZE :=n |
| |
| LDFLAGS := -m elf_$(UTS_MACHINE) |
| # Compressed kernel should be built as PIE since it may be loaded at any |
| # address by the bootloader. |
| ifeq ($(CONFIG_X86_32),y) |
| LDFLAGS += $(call ld-option, -pie) $(call ld-option, --no-dynamic-linker) |
| else |
| # To build 64-bit compressed kernel as PIE, we disable relocation |
| # overflow check to avoid relocation overflow error with a new linker |
| # command-line option, -z noreloc-overflow. |
| LDFLAGS += $(shell $(LD) --help 2>&1 | grep -q "\-z noreloc-overflow" \ |
| && echo "-z noreloc-overflow -pie --no-dynamic-linker") |
| endif |
| |
| LDFLAGS += -z noexecstack |
| LDFLAGS += $(call ld-option,--no-warn-rwx-segments) |
| |
| LDFLAGS_vmlinux := -T |
| |
| hostprogs-y := mkpiggy |
| HOST_EXTRACFLAGS += -I$(srctree)/tools/include |
| |
| sed-voffset := -e 's/^\([0-9a-fA-F]*\) [ABCDGRSTVW] \(_text\|__bss_start\|_end\)$$/\#define VO_\2 _AC(0x\1,UL)/p' |
| |
| quiet_cmd_voffset = VOFFSET $@ |
| cmd_voffset = $(NM) $< | sed -n $(sed-voffset) > $@ |
| |
| targets += ../voffset.h |
| |
| $(obj)/../voffset.h: vmlinux FORCE |
| $(call if_changed,voffset) |
| |
| $(obj)/misc.o: $(obj)/../voffset.h |
| |
| vmlinux-objs-y := $(obj)/vmlinux.lds $(obj)/head_$(BITS).o $(obj)/misc.o \ |
| $(obj)/string.o $(obj)/cmdline.o $(obj)/error.o \ |
| $(obj)/piggy.o $(obj)/cpuflags.o |
| |
| vmlinux-objs-$(CONFIG_EARLY_PRINTK) += $(obj)/early_serial_console.o |
| vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/kaslr.o |
| ifdef CONFIG_X86_64 |
| vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/pagetable.o |
| vmlinux-objs-y += $(obj)/pgtable_64.o |
| endif |
| |
| $(obj)/eboot.o: KBUILD_CFLAGS += -fshort-wchar -mno-red-zone |
| |
| vmlinux-objs-$(CONFIG_EFI_STUB) += $(obj)/eboot.o $(obj)/efi_stub_$(BITS).o \ |
| $(objtree)/drivers/firmware/efi/libstub/lib.a |
| vmlinux-objs-$(CONFIG_EFI_MIXED) += $(obj)/efi_thunk_$(BITS).o |
| |
| # The compressed kernel is built with -fPIC/-fPIE so that a boot loader |
| # can place it anywhere in memory and it will still run. However, since |
| # it is executed as-is without any ELF relocation processing performed |
| # (and has already had all relocation sections stripped from the binary), |
| # none of the code can use data relocations (e.g. static assignments of |
| # pointer values), since they will be meaningless at runtime. This check |
| # will refuse to link the vmlinux if any of these relocations are found. |
| quiet_cmd_check_data_rel = DATAREL $@ |
| define cmd_check_data_rel |
| for obj in $(filter %.o,$^); do \ |
| ${CROSS_COMPILE}readelf -S $$obj | grep -qF .rel.local && { \ |
| echo "error: $$obj has data relocations!" >&2; \ |
| exit 1; \ |
| } || true; \ |
| done |
| endef |
| |
| # We need to run two commands under "if_changed", so merge them into a |
| # single invocation. |
| quiet_cmd_check-and-link-vmlinux = LD $@ |
| cmd_check-and-link-vmlinux = $(cmd_check_data_rel); $(cmd_ld) |
| |
| $(obj)/vmlinux: $(vmlinux-objs-y) FORCE |
| $(call if_changed,check-and-link-vmlinux) |
| |
| OBJCOPYFLAGS_vmlinux.bin := -R .comment -S |
| $(obj)/vmlinux.bin: vmlinux FORCE |
| $(call if_changed,objcopy) |
| |
| targets += $(patsubst $(obj)/%,%,$(vmlinux-objs-y)) vmlinux.bin.all vmlinux.relocs |
| |
| CMD_RELOCS = arch/x86/tools/relocs |
| quiet_cmd_relocs = RELOCS $@ |
| cmd_relocs = $(CMD_RELOCS) $< > $@;$(CMD_RELOCS) --abs-relocs $< |
| $(obj)/vmlinux.relocs: vmlinux FORCE |
| $(call if_changed,relocs) |
| |
| vmlinux.bin.all-y := $(obj)/vmlinux.bin |
| vmlinux.bin.all-$(CONFIG_X86_NEED_RELOCS) += $(obj)/vmlinux.relocs |
| |
| $(obj)/vmlinux.bin.gz: $(vmlinux.bin.all-y) FORCE |
| $(call if_changed,gzip) |
| $(obj)/vmlinux.bin.bz2: $(vmlinux.bin.all-y) FORCE |
| $(call if_changed,bzip2) |
| $(obj)/vmlinux.bin.lzma: $(vmlinux.bin.all-y) FORCE |
| $(call if_changed,lzma) |
| $(obj)/vmlinux.bin.xz: $(vmlinux.bin.all-y) FORCE |
| $(call if_changed,xzkern) |
| $(obj)/vmlinux.bin.lzo: $(vmlinux.bin.all-y) FORCE |
| $(call if_changed,lzo) |
| $(obj)/vmlinux.bin.lz4: $(vmlinux.bin.all-y) FORCE |
| $(call if_changed,lz4) |
| |
| suffix-$(CONFIG_KERNEL_GZIP) := gz |
| suffix-$(CONFIG_KERNEL_BZIP2) := bz2 |
| suffix-$(CONFIG_KERNEL_LZMA) := lzma |
| suffix-$(CONFIG_KERNEL_XZ) := xz |
| suffix-$(CONFIG_KERNEL_LZO) := lzo |
| suffix-$(CONFIG_KERNEL_LZ4) := lz4 |
| |
| quiet_cmd_mkpiggy = MKPIGGY $@ |
| cmd_mkpiggy = $(obj)/mkpiggy $< > $@ || ( rm -f $@ ; false ) |
| |
| targets += piggy.S |
| $(obj)/piggy.S: $(obj)/vmlinux.bin.$(suffix-y) $(obj)/mkpiggy FORCE |
| $(call if_changed,mkpiggy) |