1 # SPDX-License-Identifier: GPL-2.0
3 # linux/arch/x86/boot/compressed/Makefile
5 # create a compressed vmlinux image from the original vmlinux
8 # decompression code (*.o)
9 # asm globals (piggy.S), including:
10 # vmlinux.bin.(gz|bz2|lzma|...)
13 # vmlinux stripped of debugging and comments
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
20 # Sanitizer runtimes are unavailable and cannot be linked for early boot code.
24 OBJECT_FILES_NON_STANDARD := y
26 # Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
29 targets := vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma \
30 vmlinux.bin.xz vmlinux.bin.lzo vmlinux.bin.lz4 vmlinux.bin.zst
32 # CLANG_FLAGS must come before any cc-disable-warning or cc-option calls in
33 # case of cross compiling, as it has the '--target=' flag, which is needed to
34 # avoid errors with '-march=i386', and future flags may depend on the target to
36 KBUILD_CFLAGS := -m$(BITS) -O2 $(CLANG_FLAGS)
37 KBUILD_CFLAGS += -fno-strict-aliasing -fPIE
38 KBUILD_CFLAGS += -Wundef
39 KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
40 cflags-$(CONFIG_X86_32) := -march=i386
41 cflags-$(CONFIG_X86_64) := -mcmodel=small -mno-red-zone
42 KBUILD_CFLAGS += $(cflags-y)
43 KBUILD_CFLAGS += -mno-mmx -mno-sse
44 KBUILD_CFLAGS += -ffreestanding -fshort-wchar
45 KBUILD_CFLAGS += -fno-stack-protector
46 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
47 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
48 KBUILD_CFLAGS += -Wno-pointer-sign
49 KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
50 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
51 KBUILD_CFLAGS += -D__DISABLE_EXPORTS
52 # Disable relocation relaxation in case the link is not PIE.
53 KBUILD_CFLAGS += $(call cc-option,-Wa$(comma)-mrelax-relocations=no)
54 KBUILD_CFLAGS += -include $(srctree)/include/linux/hidden.h
56 # sev.c indirectly inludes inat-table.h which is generated during
57 # compilation and stored in $(objtree). Add the directory to the includes so
58 # that the compiler finds it even with out-of-tree builds (make O=/some/path).
59 CFLAGS_sev.o += -I$(objtree)/arch/x86/lib/
61 KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__
65 KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE)
66 KBUILD_LDFLAGS += $(call ld-option,--no-ld-generated-unwind-info)
67 # Compressed kernel should be built as PIE since it may be loaded at any
68 # address by the bootloader.
69 LDFLAGS_vmlinux := -pie $(call ld-option, --no-dynamic-linker)
70 ifdef CONFIG_LD_ORPHAN_WARN
71 LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
73 LDFLAGS_vmlinux += -z noexecstack
74 ifeq ($(CONFIG_LD_IS_BFD),y)
75 LDFLAGS_vmlinux += $(call ld-option,--no-warn-rwx-segments)
77 ifeq ($(CONFIG_EFI_STUB),y)
78 # ensure that the static EFI stub library will be pulled in, even if it is
79 # never referenced explicitly from the startup code
80 LDFLAGS_vmlinux += -u efi_pe_entry
85 HOST_EXTRACFLAGS += -I$(srctree)/tools/include
87 sed-voffset := -e 's/^\([0-9a-fA-F]*\) [ABCDGRSTVW] \(_text\|__bss_start\|_end\)$$/\#define VO_\2 _AC(0x\1,UL)/p'
89 quiet_cmd_voffset = VOFFSET $@
90 cmd_voffset = $(NM) $< | sed -n $(sed-voffset) > $@
92 targets += ../voffset.h
94 $(obj)/../voffset.h: vmlinux FORCE
95 $(call if_changed,voffset)
97 $(obj)/misc.o: $(obj)/../voffset.h
99 vmlinux-objs-y := $(obj)/vmlinux.lds $(obj)/kernel_info.o $(obj)/head_$(BITS).o \
100 $(obj)/misc.o $(obj)/string.o $(obj)/cmdline.o $(obj)/error.o \
101 $(obj)/piggy.o $(obj)/cpuflags.o
103 vmlinux-objs-$(CONFIG_EARLY_PRINTK) += $(obj)/early_serial_console.o
104 vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/kaslr.o
106 vmlinux-objs-y += $(obj)/ident_map_64.o
107 vmlinux-objs-y += $(obj)/idt_64.o $(obj)/idt_handlers_64.o
108 vmlinux-objs-$(CONFIG_AMD_MEM_ENCRYPT) += $(obj)/mem_encrypt.o
109 vmlinux-objs-y += $(obj)/pgtable_64.o
110 vmlinux-objs-$(CONFIG_AMD_MEM_ENCRYPT) += $(obj)/sev.o
113 vmlinux-objs-$(CONFIG_ACPI) += $(obj)/acpi.o
114 vmlinux-objs-$(CONFIG_INTEL_TDX_GUEST) += $(obj)/tdx.o $(obj)/tdcall.o $(obj)/tdx-shared.o
115 vmlinux-objs-$(CONFIG_UNACCEPTED_MEMORY) += $(obj)/mem.o
117 vmlinux-objs-$(CONFIG_EFI) += $(obj)/efi.o
118 vmlinux-objs-$(CONFIG_EFI_MIXED) += $(obj)/efi_mixed.o
119 vmlinux-objs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
121 $(obj)/vmlinux: $(vmlinux-objs-y) FORCE
122 $(call if_changed,ld)
124 OBJCOPYFLAGS_vmlinux.bin := -R .comment -S
125 $(obj)/vmlinux.bin: vmlinux FORCE
126 $(call if_changed,objcopy)
128 targets += $(patsubst $(obj)/%,%,$(vmlinux-objs-y)) vmlinux.bin.all vmlinux.relocs
130 # vmlinux.relocs is created by the vmlinux postlink step.
131 $(obj)/vmlinux.relocs: vmlinux
134 vmlinux.bin.all-y := $(obj)/vmlinux.bin
135 vmlinux.bin.all-$(CONFIG_X86_NEED_RELOCS) += $(obj)/vmlinux.relocs
137 $(obj)/vmlinux.bin.gz: $(vmlinux.bin.all-y) FORCE
138 $(call if_changed,gzip)
139 $(obj)/vmlinux.bin.bz2: $(vmlinux.bin.all-y) FORCE
140 $(call if_changed,bzip2_with_size)
141 $(obj)/vmlinux.bin.lzma: $(vmlinux.bin.all-y) FORCE
142 $(call if_changed,lzma_with_size)
143 $(obj)/vmlinux.bin.xz: $(vmlinux.bin.all-y) FORCE
144 $(call if_changed,xzkern_with_size)
145 $(obj)/vmlinux.bin.lzo: $(vmlinux.bin.all-y) FORCE
146 $(call if_changed,lzo_with_size)
147 $(obj)/vmlinux.bin.lz4: $(vmlinux.bin.all-y) FORCE
148 $(call if_changed,lz4_with_size)
149 $(obj)/vmlinux.bin.zst: $(vmlinux.bin.all-y) FORCE
150 $(call if_changed,zstd22_with_size)
152 suffix-$(CONFIG_KERNEL_GZIP) := gz
153 suffix-$(CONFIG_KERNEL_BZIP2) := bz2
154 suffix-$(CONFIG_KERNEL_LZMA) := lzma
155 suffix-$(CONFIG_KERNEL_XZ) := xz
156 suffix-$(CONFIG_KERNEL_LZO) := lzo
157 suffix-$(CONFIG_KERNEL_LZ4) := lz4
158 suffix-$(CONFIG_KERNEL_ZSTD) := zst
160 quiet_cmd_mkpiggy = MKPIGGY $@
161 cmd_mkpiggy = $(obj)/mkpiggy $< > $@
164 $(obj)/piggy.S: $(obj)/vmlinux.bin.$(suffix-y) $(obj)/mkpiggy FORCE
165 $(call if_changed,mkpiggy)