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.
21KASAN_SANITIZE			:= n
22KCSAN_SANITIZE			:= n
23KMSAN_SANITIZE			:= n
24OBJECT_FILES_NON_STANDARD	:= y
25
26# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
27KCOV_INSTRUMENT		:= n
28
29targets := 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
31
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
35# be valid.
36KBUILD_CFLAGS := -m$(BITS) -O2 $(CLANG_FLAGS)
37KBUILD_CFLAGS += -fno-strict-aliasing -fPIE
38KBUILD_CFLAGS += -Wundef
39KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
40cflags-$(CONFIG_X86_32) := -march=i386
41cflags-$(CONFIG_X86_64) := -mcmodel=small -mno-red-zone
42KBUILD_CFLAGS += $(cflags-y)
43KBUILD_CFLAGS += -mno-mmx -mno-sse
44KBUILD_CFLAGS += -ffreestanding -fshort-wchar
45KBUILD_CFLAGS += -fno-stack-protector
46KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
47KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
48KBUILD_CFLAGS += -Wno-pointer-sign
49KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
50KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
51KBUILD_CFLAGS += -D__DISABLE_EXPORTS
52# Disable relocation relaxation in case the link is not PIE.
53KBUILD_CFLAGS += $(call cc-option,-Wa$(comma)-mrelax-relocations=no)
54KBUILD_CFLAGS += -include $(srctree)/include/linux/hidden.h
55
56# sev.c indirectly inludes inat-table.h which is generated during
57# compilation and stored in $(objtree). Add the directory to the includes so
58# that the compiler finds it even with out-of-tree builds (make O=/some/path).
59CFLAGS_sev.o += -I$(objtree)/arch/x86/lib/
60
61KBUILD_AFLAGS  := $(KBUILD_CFLAGS) -D__ASSEMBLY__
62GCOV_PROFILE := n
63UBSAN_SANITIZE :=n
64
65KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE)
66KBUILD_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.
69LDFLAGS_vmlinux := -pie $(call ld-option, --no-dynamic-linker)
70ifdef CONFIG_LD_ORPHAN_WARN
71LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
72endif
73LDFLAGS_vmlinux += -z noexecstack
74ifeq ($(CONFIG_LD_IS_BFD),y)
75LDFLAGS_vmlinux += $(call ld-option,--no-warn-rwx-segments)
76endif
77ifeq ($(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
80LDFLAGS_vmlinux += -u efi_pe_entry
81endif
82LDFLAGS_vmlinux += -T
83
84hostprogs	:= mkpiggy
85HOST_EXTRACFLAGS += -I$(srctree)/tools/include
86
87sed-voffset := -e 's/^\([0-9a-fA-F]*\) [ABCDGRSTVW] \(_text\|__bss_start\|_end\)$$/\#define VO_\2 _AC(0x\1,UL)/p'
88
89quiet_cmd_voffset = VOFFSET $@
90      cmd_voffset = $(NM) $< | sed -n $(sed-voffset) > $@
91
92targets += ../voffset.h
93
94$(obj)/../voffset.h: vmlinux FORCE
95	$(call if_changed,voffset)
96
97$(obj)/misc.o: $(obj)/../voffset.h
98
99vmlinux-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 $(obj)/cpuflags.o
102
103vmlinux-objs-$(CONFIG_EARLY_PRINTK) += $(obj)/early_serial_console.o
104vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/kaslr.o
105ifdef CONFIG_X86_64
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) += $(obj)/sev.o
111endif
112
113vmlinux-objs-$(CONFIG_ACPI) += $(obj)/acpi.o
114vmlinux-objs-$(CONFIG_INTEL_TDX_GUEST) += $(obj)/tdx.o $(obj)/tdcall.o $(obj)/tdx-shared.o
115vmlinux-objs-$(CONFIG_UNACCEPTED_MEMORY) += $(obj)/mem.o
116
117vmlinux-objs-$(CONFIG_EFI) += $(obj)/efi.o
118vmlinux-objs-$(CONFIG_EFI_MIXED) += $(obj)/efi_mixed.o
119vmlinux-objs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
120
121$(obj)/vmlinux: $(vmlinux-objs-y) FORCE
122	$(call if_changed,ld)
123
124OBJCOPYFLAGS_vmlinux.bin :=  -R .comment -S
125$(obj)/vmlinux.bin: vmlinux FORCE
126	$(call if_changed,objcopy)
127
128targets += $(patsubst $(obj)/%,%,$(vmlinux-objs-y)) vmlinux.bin.all vmlinux.relocs
129
130# vmlinux.relocs is created by the vmlinux postlink step.
131$(obj)/vmlinux.relocs: vmlinux
132	@true
133
134vmlinux.bin.all-y := $(obj)/vmlinux.bin
135vmlinux.bin.all-$(CONFIG_X86_NEED_RELOCS) += $(obj)/vmlinux.relocs
136
137$(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	$(call if_changed,zstd22_with_size)
151
152suffix-$(CONFIG_KERNEL_GZIP)	:= gz
153suffix-$(CONFIG_KERNEL_BZIP2)	:= bz2
154suffix-$(CONFIG_KERNEL_LZMA)	:= lzma
155suffix-$(CONFIG_KERNEL_XZ)	:= xz
156suffix-$(CONFIG_KERNEL_LZO) 	:= lzo
157suffix-$(CONFIG_KERNEL_LZ4) 	:= lz4
158suffix-$(CONFIG_KERNEL_ZSTD)	:= zst
159
160quiet_cmd_mkpiggy = MKPIGGY $@
161      cmd_mkpiggy = $(obj)/mkpiggy $< > $@
162
163targets += piggy.S
164$(obj)/piggy.S: $(obj)/vmlinux.bin.$(suffix-y) $(obj)/mkpiggy FORCE
165	$(call if_changed,mkpiggy)
166