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] \(_text\|__bss_start\|_end\)$$/\#define VO_\2 _AC(0x\1,UL)/p'
62 quiet_cmd_voffset
= VOFFSET
$@
63 cmd_voffset
= $(NM
) $< | sed
-n
$(sed-voffset
) > $@
65 targets
+= ..
/voffset.h
67 $(obj
)/..
/voffset.h
: vmlinux FORCE
68 $(call if_changed
,voffset
)
70 $(obj
)/misc.o
: $(obj
)/..
/voffset.h
72 vmlinux-objs-y
:= $(obj
)/vmlinux.lds
$(obj
)/head_
$(BITS
).o
$(obj
)/misc.o \
73 $(obj
)/string.o
$(obj
)/cmdline.o
$(obj
)/error.o \
74 $(obj
)/piggy.o
$(obj
)/cpuflags.o
76 vmlinux-objs-
$(CONFIG_EARLY_PRINTK
) += $(obj
)/early_serial_console.o
77 vmlinux-objs-
$(CONFIG_RANDOMIZE_BASE
) += $(obj
)/kaslr.o
79 vmlinux-objs-
$(CONFIG_RANDOMIZE_BASE
) += $(obj
)/pagetable.o
82 $(obj
)/eboot.o
: KBUILD_CFLAGS
+= -fshort-wchar
-mno-red-zone
84 vmlinux-objs-
$(CONFIG_EFI_STUB
) += $(obj
)/eboot.o
$(obj
)/efi_stub_
$(BITS
).o \
85 $(objtree
)/drivers
/firmware
/efi
/libstub
/lib.a
86 vmlinux-objs-
$(CONFIG_EFI_MIXED
) += $(obj
)/efi_thunk_
$(BITS
).o
88 # The compressed kernel is built with -fPIC/-fPIE so that a boot loader
89 # can place it anywhere in memory and it will still run. However, since
90 # it is executed as-is without any ELF relocation processing performed
91 # (and has already had all relocation sections stripped from the binary),
92 # none of the code can use data relocations (e.g. static assignments of
93 # pointer values), since they will be meaningless at runtime. This check
94 # will refuse to link the vmlinux if any of these relocations are found.
95 quiet_cmd_check_data_rel
= DATAREL
$@
96 define cmd_check_data_rel
97 for obj in
$(filter %.o
,$^
); do \
98 readelf
-S
$$obj | grep
-qF .rel.local
&& { \
99 echo
"error: $$obj has data relocations!" >&2; \
105 $(obj
)/vmlinux
: $(vmlinux-objs-y
) FORCE
106 $(call if_changed
,check_data_rel
)
107 $(call if_changed
,ld)
109 OBJCOPYFLAGS_vmlinux.bin
:= -R .comment
-S
110 $(obj
)/vmlinux.bin
: vmlinux FORCE
111 $(call if_changed
,objcopy
)
113 targets
+= $(patsubst $(obj
)/%,%,$(vmlinux-objs-y
)) vmlinux.bin.
all vmlinux.relocs
115 CMD_RELOCS
= arch
/x86
/tools
/relocs
116 quiet_cmd_relocs
= RELOCS
$@
117 cmd_relocs
= $(CMD_RELOCS
) $< > $@
;$(CMD_RELOCS
) --abs-relocs
$<
118 $(obj
)/vmlinux.relocs
: vmlinux FORCE
119 $(call if_changed
,relocs
)
121 vmlinux.bin.all-y
:= $(obj
)/vmlinux.bin
122 vmlinux.bin.all-
$(CONFIG_X86_NEED_RELOCS
) += $(obj
)/vmlinux.relocs
124 $(obj
)/vmlinux.bin.gz
: $(vmlinux.bin.all-y
) FORCE
125 $(call if_changed
,gzip
)
126 $(obj
)/vmlinux.bin.bz2
: $(vmlinux.bin.all-y
) FORCE
127 $(call if_changed
,bzip2
)
128 $(obj
)/vmlinux.bin.lzma
: $(vmlinux.bin.all-y
) FORCE
129 $(call if_changed
,lzma
)
130 $(obj
)/vmlinux.bin.xz
: $(vmlinux.bin.all-y
) FORCE
131 $(call if_changed
,xzkern
)
132 $(obj
)/vmlinux.bin.lzo
: $(vmlinux.bin.all-y
) FORCE
133 $(call if_changed
,lzo
)
134 $(obj
)/vmlinux.bin.lz4
: $(vmlinux.bin.all-y
) FORCE
135 $(call if_changed
,lz4
)
137 suffix-
$(CONFIG_KERNEL_GZIP
) := gz
138 suffix-
$(CONFIG_KERNEL_BZIP2
) := bz2
139 suffix-
$(CONFIG_KERNEL_LZMA
) := lzma
140 suffix-
$(CONFIG_KERNEL_XZ
) := xz
141 suffix-
$(CONFIG_KERNEL_LZO
) := lzo
142 suffix-
$(CONFIG_KERNEL_LZ4
) := lz4
144 quiet_cmd_mkpiggy
= MKPIGGY
$@
145 cmd_mkpiggy
= $(obj
)/mkpiggy
$< > $@ ||
( rm -f
$@
; false
)
148 $(obj
)/piggy.S
: $(obj
)/vmlinux.bin.
$(suffix-y
) $(obj
)/mkpiggy FORCE
149 $(call if_changed
,mkpiggy
)