161 lines
5.6 KiB
Makefile
161 lines
5.6 KiB
Makefile
# 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) -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)
|
|
KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
|
|
KBUILD_CFLAGS += -Wno-pointer-sign
|
|
# Disable relocation relaxation in case the link is not PIE.
|
|
KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mrelax-relocations=no)
|
|
|
|
KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__
|
|
GCOV_PROFILE := n
|
|
UBSAN_SANITIZE :=n
|
|
|
|
KBUILD_LDFLAGS := -m elf_$(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)
|
|
KBUILD_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.
|
|
KBUILD_LDFLAGS += $(shell $(LD) --help 2>&1 | grep -q "\-z noreloc-overflow" \
|
|
&& echo "-z noreloc-overflow -pie --no-dynamic-linker")
|
|
endif
|
|
LDFLAGS_vmlinux := -T
|
|
|
|
hostprogs-y := mkpiggy
|
|
HOST_EXTRACFLAGS += -I$(srctree)/tools/include
|
|
|
|
sed-voffset := -e 's/^\([0-9a-fA-F]*\) [ABCDGRSTVW] \(_text\|__bss_start\|_end\)$$/\#define VO_\2 _AC(0x\1,UL)/p'
|
|
|
|
quiet_cmd_voffset = VOFFSET $@
|
|
cmd_voffset = $(NM) $< | sed -n $(sed-voffset) > $@
|
|
|
|
targets += ../voffset.h
|
|
|
|
$(obj)/../voffset.h: vmlinux FORCE
|
|
$(call if_changed,voffset)
|
|
|
|
$(obj)/misc.o: $(obj)/../voffset.h
|
|
|
|
vmlinux-objs-y := $(obj)/vmlinux.lds $(obj)/head_$(BITS).o $(obj)/misc.o \
|
|
$(obj)/string.o $(obj)/cmdline.o $(obj)/error.o \
|
|
$(obj)/piggy.o $(obj)/cpuflags.o
|
|
|
|
vmlinux-objs-$(CONFIG_EARLY_PRINTK) += $(obj)/early_serial_console.o
|
|
vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/kaslr.o
|
|
ifdef CONFIG_X86_64
|
|
vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/kaslr_64.o
|
|
vmlinux-objs-y += $(obj)/mem_encrypt.o
|
|
vmlinux-objs-y += $(obj)/pgtable_64.o
|
|
endif
|
|
|
|
$(obj)/eboot.o: KBUILD_CFLAGS += -fshort-wchar -mno-red-zone
|
|
|
|
vmlinux-objs-$(CONFIG_EFI_STUB) += $(obj)/eboot.o $(obj)/efi_stub_$(BITS).o \
|
|
$(objtree)/drivers/firmware/efi/libstub/lib.a
|
|
vmlinux-objs-$(CONFIG_EFI_MIXED) += $(obj)/efi_thunk_$(BITS).o
|
|
|
|
# The compressed kernel is built with -fPIC/-fPIE so that a boot loader
|
|
# can place it anywhere in memory and it will still run. However, since
|
|
# it is executed as-is without any ELF relocation processing performed
|
|
# (and has already had all relocation sections stripped from the binary),
|
|
# none of the code can use data relocations (e.g. static assignments of
|
|
# pointer values), since they will be meaningless at runtime. This check
|
|
# will refuse to link the vmlinux if any of these relocations are found.
|
|
quiet_cmd_check_data_rel = DATAREL $@
|
|
define cmd_check_data_rel
|
|
for obj in $(filter %.o,$^); do \
|
|
$(READELF) -S $$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)
|