arch/x86/boot/compressed/Makefile

   1 #
   2 # linux/arch/x86/boot/compressed/Makefile
   3 #
   4 # create a compressed vmlinux image from the original vmlinux
   5 #
   6 # vmlinuz is:
   7 #       decompression code (*.o)
   8 #       asm globals (piggy.S), including:
   9 #               vmlinux.bin.(gz|bz2|lzma|...)
  10 #
  11 # vmlinux.bin is:
  12 #       vmlinux stripped of debugging and comments
  13 # vmlinux.bin.all is:
  14 #       vmlinux.bin + vmlinux.relocs
  15 # vmlinux.bin.(gz|bz2|lzma|...) is:
  16 #       (see scripts/Makefile.lib size_append)
  17 #       compressed vmlinux.bin.all + u32 size of vmlinux.bin.all
  18
  19 KASAN_SANITIZE                  := n
  20 OBJECT_FILES_NON_STANDARD       := y
  21
  22 # Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
  23 KCOV_INSTRUMENT         := n
  24
  25 targets := vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma \
  26         vmlinux.bin.xz vmlinux.bin.lzo vmlinux.bin.lz4
  27
  28 KBUILD_CFLAGS := -m$(BITS) -D__KERNEL__ $(LINUX_INCLUDE) -O2
  29 KBUILD_CFLAGS += -fno-strict-aliasing $(call cc-option, -fPIE, -fPIC)
  30 KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
  31 cflags-$(CONFIG_X86_32) := -march=i386
  32 cflags-$(CONFIG_X86_64) := -mcmodel=small
  33 KBUILD_CFLAGS += $(cflags-y)
  34 KBUILD_CFLAGS += -mno-mmx -mno-sse
  35 KBUILD_CFLAGS += $(call cc-option,-ffreestanding)
  36 KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector)
  37
  38 KBUILD_AFLAGS  := $(KBUILD_CFLAGS) -D__ASSEMBLY__
  39 GCOV_PROFILE := n
  40 UBSAN_SANITIZE :=n
  41
  42 LDFLAGS := -m elf_$(UTS_MACHINE)
  43 ifeq ($(CONFIG_RELOCATABLE),y)
  44 # If kernel is relocatable, build compressed kernel as PIE.
  45 ifeq ($(CONFIG_X86_32),y)
  46 LDFLAGS += $(call ld-option, -pie) $(call ld-option, --no-dynamic-linker)
  47 else
  48 # To build 64-bit compressed kernel as PIE, we disable relocation
  49 # overflow check to avoid relocation overflow error with a new linker
  50 # command-line option, -z noreloc-overflow.
  51 LDFLAGS += $(shell $(LD) --help 2>&1 | grep -q "\-z noreloc-overflow" \
  52         && echo "-z noreloc-overflow -pie --no-dynamic-linker")
  53 endif
  54 endif
  55 LDFLAGS_vmlinux := -T
  56
  57 hostprogs-y     := mkpiggy
  58 HOST_EXTRACFLAGS += -I$(srctree)/tools/include
  59
  60 vmlinux-objs-y := $(obj)/vmlinux.lds $(obj)/head_$(BITS).o $(obj)/misc.o \
  61         $(obj)/string.o $(obj)/cmdline.o \
  62         $(obj)/piggy.o $(obj)/cpuflags.o
  63
  64 vmlinux-objs-$(CONFIG_EARLY_PRINTK) += $(obj)/early_serial_console.o
  65 vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/aslr.o
  66
  67 $(obj)/eboot.o: KBUILD_CFLAGS += -fshort-wchar -mno-red-zone
  68
  69 vmlinux-objs-$(CONFIG_EFI_STUB) += $(obj)/eboot.o $(obj)/efi_stub_$(BITS).o \
  70         $(objtree)/drivers/firmware/efi/libstub/lib.a
  71 vmlinux-objs-$(CONFIG_EFI_MIXED) += $(obj)/efi_thunk_$(BITS).o
  72
  73 $(obj)/vmlinux: $(vmlinux-objs-y) FORCE
  74         $(call if_changed,ld)
  75         @:
  76
  77 OBJCOPYFLAGS_vmlinux.bin :=  -R .comment -S
  78 $(obj)/vmlinux.bin: vmlinux FORCE
  79         $(call if_changed,objcopy)
  80
  81 targets += $(patsubst $(obj)/%,%,$(vmlinux-objs-y)) vmlinux.bin.all vmlinux.relocs
  82
  83 CMD_RELOCS = arch/x86/tools/relocs
  84 quiet_cmd_relocs = RELOCS  $@
  85       cmd_relocs = $(CMD_RELOCS) $< > $@;$(CMD_RELOCS) --abs-relocs $<
  86 $(obj)/vmlinux.relocs: vmlinux FORCE
  87         $(call if_changed,relocs)
  88
  89 vmlinux.bin.all-y := $(obj)/vmlinux.bin
  90 vmlinux.bin.all-$(CONFIG_X86_NEED_RELOCS) += $(obj)/vmlinux.relocs
  91
  92 $(obj)/vmlinux.bin.gz: $(vmlinux.bin.all-y) FORCE
  93         $(call if_changed,gzip)
  94 $(obj)/vmlinux.bin.bz2: $(vmlinux.bin.all-y) FORCE
  95         $(call if_changed,bzip2)
  96 $(obj)/vmlinux.bin.lzma: $(vmlinux.bin.all-y) FORCE
  97         $(call if_changed,lzma)
  98 $(obj)/vmlinux.bin.xz: $(vmlinux.bin.all-y) FORCE
  99         $(call if_changed,xzkern)
 100 $(obj)/vmlinux.bin.lzo: $(vmlinux.bin.all-y) FORCE
 101         $(call if_changed,lzo)
 102 $(obj)/vmlinux.bin.lz4: $(vmlinux.bin.all-y) FORCE
 103         $(call if_changed,lz4)
 104
 105 suffix-$(CONFIG_KERNEL_GZIP)    := gz
 106 suffix-$(CONFIG_KERNEL_BZIP2)   := bz2
 107 suffix-$(CONFIG_KERNEL_LZMA)    := lzma
 108 suffix-$(CONFIG_KERNEL_XZ)      := xz
 109 suffix-$(CONFIG_KERNEL_LZO)     := lzo
 110 suffix-$(CONFIG_KERNEL_LZ4)     := lz4
 111
 112 RUN_SIZE = $(shell $(OBJDUMP) -h vmlinux | \
 113              $(CONFIG_SHELL) $(srctree)/arch/x86/tools/calc_run_size.sh)
 114 quiet_cmd_mkpiggy = MKPIGGY $@
 115       cmd_mkpiggy = $(obj)/mkpiggy $< $(RUN_SIZE) > $@ || ( rm -f $@ ; false )
 116
 117 targets += piggy.S
 118 $(obj)/piggy.S: $(obj)/vmlinux.bin.$(suffix-y) $(obj)/mkpiggy FORCE
 119         $(call if_changed,mkpiggy)