arch/x86/boot/compressed/Makefile

   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.
  21 KASAN_SANITIZE                  := n
  22 KCSAN_SANITIZE                  := n
  23 OBJECT_FILES_NON_STANDARD       := y
  24
  25 # Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
  26 KCOV_INSTRUMENT         := n
  27
  28 targets := vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma \
  29         vmlinux.bin.xz vmlinux.bin.lzo vmlinux.bin.lz4 vmlinux.bin.zst
  30
  31 KBUILD_CFLAGS := -m$(BITS) -O2
  32 KBUILD_CFLAGS += -fno-strict-aliasing -fPIE
  33 KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
  34 cflags-$(CONFIG_X86_32) := -march=i386
  35 cflags-$(CONFIG_X86_64) := -mcmodel=small -mno-red-zone
  36 KBUILD_CFLAGS += $(cflags-y)
  37 KBUILD_CFLAGS += -mno-mmx -mno-sse
  38 KBUILD_CFLAGS += -ffreestanding -fshort-wchar
  39 KBUILD_CFLAGS += -fno-stack-protector
  40 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
  41 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
  42 KBUILD_CFLAGS += -Wno-pointer-sign
  43 KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
  44 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
  45 KBUILD_CFLAGS += -D__DISABLE_EXPORTS
  46 # Disable relocation relaxation in case the link is not PIE.
  47 KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mrelax-relocations=no)
  48 KBUILD_CFLAGS += -include $(srctree)/include/linux/hidden.h
  49
  50 # sev-es.c indirectly inludes inat-table.h which is generated during
  51 # compilation and stored in $(objtree). Add the directory to the includes so
  52 # that the compiler finds it even with out-of-tree builds (make O=/some/path).
  53 CFLAGS_sev-es.o += -I$(objtree)/arch/x86/lib/
  54
  55 KBUILD_AFLAGS  := $(KBUILD_CFLAGS) -D__ASSEMBLY__
  56 GCOV_PROFILE := n
  57 UBSAN_SANITIZE :=n
  58
  59 KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE)
  60 KBUILD_LDFLAGS += $(call ld-option,--no-ld-generated-unwind-info)
  61 # Compressed kernel should be built as PIE since it may be loaded at any
  62 # address by the bootloader.
  63 LDFLAGS_vmlinux := -pie $(call ld-option, --no-dynamic-linker)
  64 ifdef CONFIG_LD_ORPHAN_WARN
  65 LDFLAGS_vmlinux += --orphan-handling=warn
  66 endif
  67 LDFLAGS_vmlinux += -T
  68
  69 hostprogs       := mkpiggy
  70 HOST_EXTRACFLAGS += -I$(srctree)/tools/include
  71
  72 sed-voffset := -e 's/^\([0-9a-fA-F]*\) [ABCDGRSTVW] \(_text\|__bss_start\|_end\)$$/\#define VO_\2 _AC(0x\1,UL)/p'
  73
  74 quiet_cmd_voffset = VOFFSET $@
  75       cmd_voffset = $(NM) $< | sed -n $(sed-voffset) > $@
  76
  77 targets += ../voffset.h
  78
  79 $(obj)/../voffset.h: vmlinux FORCE
  80         $(call if_changed,voffset)
  81
  82 $(obj)/misc.o: $(obj)/../voffset.h
  83
  84 vmlinux-objs-y := $(obj)/vmlinux.lds $(obj)/kernel_info.o $(obj)/head_$(BITS).o \
  85         $(obj)/misc.o $(obj)/string.o $(obj)/cmdline.o $(obj)/error.o \
  86         $(obj)/piggy.o $(obj)/cpuflags.o
  87
  88 vmlinux-objs-$(CONFIG_EARLY_PRINTK) += $(obj)/early_serial_console.o
  89 vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/kaslr.o
  90 ifdef CONFIG_X86_64
  91         vmlinux-objs-y += $(obj)/ident_map_64.o
  92         vmlinux-objs-y += $(obj)/idt_64.o $(obj)/idt_handlers_64.o
  93         vmlinux-objs-y += $(obj)/mem_encrypt.o
  94         vmlinux-objs-y += $(obj)/pgtable_64.o
  95         vmlinux-objs-$(CONFIG_AMD_MEM_ENCRYPT) += $(obj)/sev-es.o
  96 endif
  97
  98 vmlinux-objs-$(CONFIG_ACPI) += $(obj)/acpi.o
  99
 100 vmlinux-objs-$(CONFIG_EFI_MIXED) += $(obj)/efi_thunk_$(BITS).o
 101 efi-obj-$(CONFIG_EFI_STUB) = $(objtree)/drivers/firmware/efi/libstub/lib.a
 102
 103 $(obj)/vmlinux: $(vmlinux-objs-y) $(efi-obj-y) FORCE
 104         $(call if_changed,ld)
 105
 106 OBJCOPYFLAGS_vmlinux.bin :=  -R .comment -S
 107 $(obj)/vmlinux.bin: vmlinux FORCE
 108         $(call if_changed,objcopy)
 109
 110 targets += $(patsubst $(obj)/%,%,$(vmlinux-objs-y)) vmlinux.bin.all vmlinux.relocs
 111
 112 CMD_RELOCS = arch/x86/tools/relocs
 113 quiet_cmd_relocs = RELOCS  $@
 114       cmd_relocs = $(CMD_RELOCS) $< > $@;$(CMD_RELOCS) --abs-relocs $<
 115 $(obj)/vmlinux.relocs: vmlinux FORCE
 116         $(call if_changed,relocs)
 117
 118 vmlinux.bin.all-y := $(obj)/vmlinux.bin
 119 vmlinux.bin.all-$(CONFIG_X86_NEED_RELOCS) += $(obj)/vmlinux.relocs
 120
 121 $(obj)/vmlinux.bin.gz: $(vmlinux.bin.all-y) FORCE
 122         $(call if_changed,gzip)
 123 $(obj)/vmlinux.bin.bz2: $(vmlinux.bin.all-y) FORCE
 124         $(call if_changed,bzip2)
 125 $(obj)/vmlinux.bin.lzma: $(vmlinux.bin.all-y) FORCE
 126         $(call if_changed,lzma)
 127 $(obj)/vmlinux.bin.xz: $(vmlinux.bin.all-y) FORCE
 128         $(call if_changed,xzkern)
 129 $(obj)/vmlinux.bin.lzo: $(vmlinux.bin.all-y) FORCE
 130         $(call if_changed,lzo)
 131 $(obj)/vmlinux.bin.lz4: $(vmlinux.bin.all-y) FORCE
 132         $(call if_changed,lz4)
 133 $(obj)/vmlinux.bin.zst: $(vmlinux.bin.all-y) FORCE
 134         $(call if_changed,zstd22)
 135
 136 suffix-$(CONFIG_KERNEL_GZIP)    := gz
 137 suffix-$(CONFIG_KERNEL_BZIP2)   := bz2
 138 suffix-$(CONFIG_KERNEL_LZMA)    := lzma
 139 suffix-$(CONFIG_KERNEL_XZ)      := xz
 140 suffix-$(CONFIG_KERNEL_LZO)     := lzo
 141 suffix-$(CONFIG_KERNEL_LZ4)     := lz4
 142 suffix-$(CONFIG_KERNEL_ZSTD)    := zst
 143
 144 quiet_cmd_mkpiggy = MKPIGGY $@
 145       cmd_mkpiggy = $(obj)/mkpiggy $< > $@
 146
 147 targets += piggy.S
 148 $(obj)/piggy.S: $(obj)/vmlinux.bin.$(suffix-y) $(obj)/mkpiggy FORCE
 149         $(call if_changed,mkpiggy)