xref: /linux/arch/x86/boot/compressed/Makefile (revision b04b2e7a61830cabd00c6f95308a8e2f5d82fa52) 
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
20targets := vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma \
21	vmlinux.bin.xz vmlinux.bin.lzo vmlinux.bin.lz4 vmlinux.bin.zst
22
23# CLANG_FLAGS must come before any cc-disable-warning or cc-option calls in
24# case of cross compiling, as it has the '--target=' flag, which is needed to
25# avoid errors with '-march=i386', and future flags may depend on the target to
26# be valid.
27KBUILD_CFLAGS := -m$(BITS) -O2 $(CLANG_FLAGS)
28KBUILD_CFLAGS += -std=gnu11 -fms-extensions
29KBUILD_CFLAGS += -fno-strict-aliasing -fPIE
30KBUILD_CFLAGS += -Wundef
31KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
32cflags-$(CONFIG_X86_32) := -march=i386
33cflags-$(CONFIG_X86_64) := -mcmodel=small -mno-red-zone
34KBUILD_CFLAGS += $(cflags-y)
35KBUILD_CFLAGS += -mno-mmx -mno-sse
36KBUILD_CFLAGS += -ffreestanding -fshort-wchar
37KBUILD_CFLAGS += -fno-stack-protector
38KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
39ifdef CONFIG_CC_IS_CLANG
40KBUILD_CFLAGS += -Wno-gnu
41KBUILD_CFLAGS += -Wno-microsoft-anon-tag
42endif
43KBUILD_CFLAGS += -Wno-pointer-sign
44KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
45KBUILD_CFLAGS += -D__DISABLE_EXPORTS
46# Disable relocation relaxation in case the link is not PIE.
47KBUILD_CFLAGS += $(call cc-option,-Wa$(comma)-mrelax-relocations=no)
48KBUILD_CFLAGS += -include $(srctree)/include/linux/hidden.h
49
50# sev-decode-insn.c indirectly includes inat-table.c which is generated during
51# compilation and stored in $(objtree). Add the directory to the includes so
52# that the compiler finds it even with out-of-tree builds (make O=/some/path).
53CFLAGS_sev-handle-vc.o += -I$(objtree)/arch/x86/lib/
54
55KBUILD_AFLAGS  := $(KBUILD_CFLAGS) -D__ASSEMBLY__
56
57KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE)
58KBUILD_LDFLAGS += $(call ld-option,--no-ld-generated-unwind-info)
59# Compressed kernel should be built as PIE since it may be loaded at any
60# address by the bootloader.
61LDFLAGS_vmlinux := -pie $(call ld-option, --no-dynamic-linker)
62ifdef CONFIG_LD_ORPHAN_WARN
63LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
64endif
65LDFLAGS_vmlinux += -z noexecstack
66ifeq ($(CONFIG_LD_IS_BFD),y)
67LDFLAGS_vmlinux += $(call ld-option,--no-warn-rwx-segments)
68endif
69ifeq ($(CONFIG_EFI_STUB),y)
70# ensure that the static EFI stub library will be pulled in, even if it is
71# never referenced explicitly from the startup code
72LDFLAGS_vmlinux += -u efi_pe_entry
73endif
74LDFLAGS_vmlinux += -T
75
76hostprogs	:= mkpiggy
77HOST_EXTRACFLAGS += -I$(srctree)/tools/include
78
79sed-voffset := -e 's/^\([0-9a-fA-F]*\) [ABbCDGRSTtVW] \(_text\|__start_rodata\|_sinittext\|__inittext_end\|__bss_start\|_end\)$$/\#define VO_\2 _AC(0x\1,UL)/p'
80
81quiet_cmd_voffset = VOFFSET $@
82      cmd_voffset = $(NM) $< | sed -n $(sed-voffset) > $@
83
84targets += ../voffset.h
85
86$(obj)/../voffset.h: vmlinux FORCE
87	$(call if_changed,voffset)
88
89$(obj)/misc.o: $(obj)/../voffset.h
90
91vmlinux-objs-y := $(obj)/vmlinux.lds $(obj)/kernel_info.o $(obj)/head_$(BITS).o \
92	$(obj)/misc.o $(obj)/string.o $(obj)/cmdline.o $(obj)/error.o \
93	$(obj)/piggy.o $(obj)/cpuflags.o
94
95vmlinux-objs-$(CONFIG_EARLY_PRINTK) += $(obj)/early_serial_console.o
96vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/kaslr.o
97ifdef CONFIG_X86_64
98	vmlinux-objs-y += $(obj)/ident_map_64.o
99	vmlinux-objs-y += $(obj)/idt_64.o $(obj)/idt_handlers_64.o
100	vmlinux-objs-$(CONFIG_AMD_MEM_ENCRYPT) += $(obj)/mem_encrypt.o
101	vmlinux-objs-y += $(obj)/pgtable_64.o
102	vmlinux-objs-$(CONFIG_AMD_MEM_ENCRYPT) += $(obj)/sev.o $(obj)/sev-handle-vc.o
103endif
104
105vmlinux-objs-$(CONFIG_ACPI) += $(obj)/acpi.o
106vmlinux-objs-$(CONFIG_INTEL_TDX_GUEST) += $(obj)/tdx.o $(obj)/tdcall.o $(obj)/tdx-shared.o
107vmlinux-objs-$(CONFIG_UNACCEPTED_MEMORY) += $(obj)/mem.o
108
109vmlinux-objs-$(CONFIG_EFI) += $(obj)/efi.o
110vmlinux-libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
111vmlinux-libs-$(CONFIG_X86_64)	+= $(objtree)/arch/x86/boot/startup/lib.a
112vmlinux-objs-$(CONFIG_EFI_SBAT) += $(obj)/sbat.o
113
114ifdef CONFIG_EFI_SBAT
115$(obj)/sbat.o: $(CONFIG_EFI_SBAT_FILE)
116endif
117
118$(obj)/vmlinux: $(vmlinux-objs-y) $(vmlinux-libs-y) FORCE
119	$(call if_changed,ld)
120
121OBJCOPYFLAGS_vmlinux.bin :=  -R .comment -S
122$(obj)/vmlinux.bin: vmlinux FORCE
123	$(call if_changed,objcopy)
124
125targets += $(patsubst $(obj)/%,%,$(vmlinux-objs-y)) vmlinux.bin.all vmlinux.relocs
126
127CMD_RELOCS = arch/x86/tools/relocs
128quiet_cmd_relocs = RELOCS  $@
129      cmd_relocs = $(CMD_RELOCS) $< > $@;$(CMD_RELOCS) --abs-relocs $<
130
131$(obj)/vmlinux.relocs: vmlinux.unstripped FORCE
132	$(call if_changed,relocs)
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