2 # linux/arch/x86/boot/compressed/Makefile
4 # create a compressed vmlinux image from the original vmlinux
7 # decompression code (*.o)
8 # asm globals (piggy.S), including:
9 # vmlinux.bin.(gz|bz2|lzma|...)
12 # vmlinux stripped of debugging and comments
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
20 OBJECT_FILES_NON_STANDARD := y
22 # Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
25 targets := vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma \
26 vmlinux.bin.xz vmlinux.bin.lzo vmlinux.bin.lz4
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)
38 KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__
42 LDFLAGS := -m elf_$(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)
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 $(LD) --help 2>&1 | grep -q "\-z noreloc-overflow" \
52 && echo "-z noreloc-overflow -pie --no-dynamic-linker")
57 hostprogs-y := mkpiggy
58 HOST_EXTRACFLAGS += -I$(srctree)/tools/include
60 sed-voffset := -e 's/^\([0-9a-fA-F]*\) [ABCDGRSTVW] \(_text\|__bss_start\|_end\)$$/\#define VO_\2 _AC(0x\1,UL)/p'
62 quiet_cmd_voffset = VOFFSET $@
63 cmd_voffset = $(NM) $< | sed -n $(sed-voffset) > $@
65 targets += ../voffset.h
67 $(obj)/../voffset.h: vmlinux FORCE
68 $(call if_changed,voffset)
70 $(obj)/misc.o: $(obj)/../voffset.h
72 vmlinux-objs-y := $(obj)/vmlinux.lds $(obj)/head_$(BITS).o $(obj)/misc.o \
73 $(obj)/string.o $(obj)/cmdline.o $(obj)/error.o \
74 $(obj)/piggy.o $(obj)/cpuflags.o
76 vmlinux-objs-$(CONFIG_EARLY_PRINTK) += $(obj)/early_serial_console.o
77 vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/kaslr.o
79 vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/pagetable.o
82 $(obj)/eboot.o: KBUILD_CFLAGS += -fshort-wchar -mno-red-zone
84 vmlinux-objs-$(CONFIG_EFI_STUB) += $(obj)/eboot.o $(obj)/efi_stub_$(BITS).o \
85 $(objtree)/drivers/firmware/efi/libstub/lib.a
86 vmlinux-objs-$(CONFIG_EFI_MIXED) += $(obj)/efi_thunk_$(BITS).o
88 $(obj)/vmlinux: $(vmlinux-objs-y) FORCE
91 OBJCOPYFLAGS_vmlinux.bin := -R .comment -S
92 $(obj)/vmlinux.bin: vmlinux FORCE
93 $(call if_changed,objcopy)
95 targets += $(patsubst $(obj)/%,%,$(vmlinux-objs-y)) vmlinux.bin.all vmlinux.relocs
97 CMD_RELOCS = arch/x86/tools/relocs
98 quiet_cmd_relocs = RELOCS $@
99 cmd_relocs = $(CMD_RELOCS) $< > $@;$(CMD_RELOCS) --abs-relocs $<
100 $(obj)/vmlinux.relocs: vmlinux FORCE
101 $(call if_changed,relocs)
103 vmlinux.bin.all-y := $(obj)/vmlinux.bin
104 vmlinux.bin.all-$(CONFIG_X86_NEED_RELOCS) += $(obj)/vmlinux.relocs
106 $(obj)/vmlinux.bin.gz: $(vmlinux.bin.all-y) FORCE
107 $(call if_changed,gzip)
108 $(obj)/vmlinux.bin.bz2: $(vmlinux.bin.all-y) FORCE
109 $(call if_changed,bzip2)
110 $(obj)/vmlinux.bin.lzma: $(vmlinux.bin.all-y) FORCE
111 $(call if_changed,lzma)
112 $(obj)/vmlinux.bin.xz: $(vmlinux.bin.all-y) FORCE
113 $(call if_changed,xzkern)
114 $(obj)/vmlinux.bin.lzo: $(vmlinux.bin.all-y) FORCE
115 $(call if_changed,lzo)
116 $(obj)/vmlinux.bin.lz4: $(vmlinux.bin.all-y) FORCE
117 $(call if_changed,lz4)
119 suffix-$(CONFIG_KERNEL_GZIP) := gz
120 suffix-$(CONFIG_KERNEL_BZIP2) := bz2
121 suffix-$(CONFIG_KERNEL_LZMA) := lzma
122 suffix-$(CONFIG_KERNEL_XZ) := xz
123 suffix-$(CONFIG_KERNEL_LZO) := lzo
124 suffix-$(CONFIG_KERNEL_LZ4) := lz4
126 quiet_cmd_mkpiggy = MKPIGGY $@
127 cmd_mkpiggy = $(obj)/mkpiggy $< > $@ || ( rm -f $@ ; false )
130 $(obj)/piggy.S: $(obj)/vmlinux.bin.$(suffix-y) $(obj)/mkpiggy FORCE
131 $(call if_changed,mkpiggy)