xref: /openbmc/linux/arch/x86/boot/compressed/Makefile (revision 6abeae2a) 
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
23OBJECT_FILES_NON_STANDARD	:= y
24
25# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
26KCOV_INSTRUMENT		:= n
27
28targets := vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma \
29	vmlinux.bin.xz vmlinux.bin.lzo vmlinux.bin.lz4 vmlinux.bin.zst
30
31KBUILD_CFLAGS := -m$(BITS) -O2
32KBUILD_CFLAGS += -fno-strict-aliasing -fPIE
33KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
34cflags-$(CONFIG_X86_32) := -march=i386
35cflags-$(CONFIG_X86_64) := -mcmodel=small -mno-red-zone
36KBUILD_CFLAGS += $(cflags-y)
37KBUILD_CFLAGS += -mno-mmx -mno-sse
38KBUILD_CFLAGS += -ffreestanding -fshort-wchar
39KBUILD_CFLAGS += -fno-stack-protector
40KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
41KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
42KBUILD_CFLAGS += -Wno-pointer-sign
43KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
44KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
45KBUILD_CFLAGS += -D__DISABLE_EXPORTS
46# Disable relocation relaxation in case the link is not PIE.
47KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mrelax-relocations=no)
48KBUILD_CFLAGS += -include $(srctree)/include/linux/hidden.h
49
50# sev-es.c indirectly inludes inat-table.h which is generated during
51# compilation and stored in $(objtree). Add the directory to the includes so
52# that the compiler finds it even with out-of-tree builds (make O=/some/path).
53CFLAGS_sev-es.o += -I$(objtree)/arch/x86/lib/
54
55KBUILD_AFLAGS  := $(KBUILD_CFLAGS) -D__ASSEMBLY__
56GCOV_PROFILE := n
57UBSAN_SANITIZE :=n
58
59KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE)
60KBUILD_LDFLAGS += $(call ld-option,--no-ld-generated-unwind-info)
61# Compressed kernel should be built as PIE since it may be loaded at any
62# address by the bootloader.
63LDFLAGS_vmlinux := -pie $(call ld-option, --no-dynamic-linker)
64ifdef CONFIG_LD_ORPHAN_WARN
65LDFLAGS_vmlinux += --orphan-handling=warn
66endif
67LDFLAGS_vmlinux += -T
68
69hostprogs	:= mkpiggy
70HOST_EXTRACFLAGS += -I$(srctree)/tools/include
71
72sed-voffset := -e 's/^\([0-9a-fA-F]*\) [ABCDGRSTVW] \(_text\|__bss_start\|_end\)$$/\#define VO_\2 _AC(0x\1,UL)/p'
73
74quiet_cmd_voffset = VOFFSET $@
75      cmd_voffset = $(NM) $< | sed -n $(sed-voffset) > $@
76
77targets += ../voffset.h
78
79$(obj)/../voffset.h: vmlinux FORCE
80	$(call if_changed,voffset)
81
82$(obj)/misc.o: $(obj)/../voffset.h
83
84vmlinux-objs-y := $(obj)/vmlinux.lds $(obj)/kernel_info.o $(obj)/head_$(BITS).o \
85	$(obj)/misc.o $(obj)/string.o $(obj)/cmdline.o $(obj)/error.o \
86	$(obj)/piggy.o $(obj)/cpuflags.o
87
88vmlinux-objs-$(CONFIG_EARLY_PRINTK) += $(obj)/early_serial_console.o
89vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/kaslr.o
90ifdef CONFIG_X86_64
91	vmlinux-objs-y += $(obj)/ident_map_64.o
92	vmlinux-objs-y += $(obj)/idt_64.o $(obj)/idt_handlers_64.o
93	vmlinux-objs-y += $(obj)/mem_encrypt.o
94	vmlinux-objs-y += $(obj)/pgtable_64.o
95	vmlinux-objs-$(CONFIG_AMD_MEM_ENCRYPT) += $(obj)/sev-es.o
96endif
97
98vmlinux-objs-$(CONFIG_ACPI) += $(obj)/acpi.o
99
100vmlinux-objs-$(CONFIG_EFI_MIXED) += $(obj)/efi_thunk_$(BITS).o
101efi-obj-$(CONFIG_EFI_STUB) = $(objtree)/drivers/firmware/efi/libstub/lib.a
102
103$(obj)/vmlinux: $(vmlinux-objs-y) $(efi-obj-y) FORCE
104	$(call if_changed,ld)
105
106OBJCOPYFLAGS_vmlinux.bin :=  -R .comment -S
107$(obj)/vmlinux.bin: vmlinux FORCE
108	$(call if_changed,objcopy)
109
110targets += $(patsubst $(obj)/%,%,$(vmlinux-objs-y)) vmlinux.bin.all vmlinux.relocs
111
112CMD_RELOCS = arch/x86/tools/relocs
113quiet_cmd_relocs = RELOCS  $@
114      cmd_relocs = $(CMD_RELOCS) $< > $@;$(CMD_RELOCS) --abs-relocs $<
115$(obj)/vmlinux.relocs: vmlinux FORCE
116	$(call if_changed,relocs)
117
118vmlinux.bin.all-y := $(obj)/vmlinux.bin
119vmlinux.bin.all-$(CONFIG_X86_NEED_RELOCS) += $(obj)/vmlinux.relocs
120
121$(obj)/vmlinux.bin.gz: $(vmlinux.bin.all-y) FORCE
122	$(call if_changed,gzip)
123$(obj)/vmlinux.bin.bz2: $(vmlinux.bin.all-y) FORCE
124	$(call if_changed,bzip2)
125$(obj)/vmlinux.bin.lzma: $(vmlinux.bin.all-y) FORCE
126	$(call if_changed,lzma)
127$(obj)/vmlinux.bin.xz: $(vmlinux.bin.all-y) FORCE
128	$(call if_changed,xzkern)
129$(obj)/vmlinux.bin.lzo: $(vmlinux.bin.all-y) FORCE
130	$(call if_changed,lzo)
131$(obj)/vmlinux.bin.lz4: $(vmlinux.bin.all-y) FORCE
132	$(call if_changed,lz4)
133$(obj)/vmlinux.bin.zst: $(vmlinux.bin.all-y) FORCE
134	$(call if_changed,zstd22)
135
136suffix-$(CONFIG_KERNEL_GZIP)	:= gz
137suffix-$(CONFIG_KERNEL_BZIP2)	:= bz2
138suffix-$(CONFIG_KERNEL_LZMA)	:= lzma
139suffix-$(CONFIG_KERNEL_XZ)	:= xz
140suffix-$(CONFIG_KERNEL_LZO) 	:= lzo
141suffix-$(CONFIG_KERNEL_LZ4) 	:= lz4
142suffix-$(CONFIG_KERNEL_ZSTD)	:= zst
143
144quiet_cmd_mkpiggy = MKPIGGY $@
145      cmd_mkpiggy = $(obj)/mkpiggy $< > $@
146
147targets += piggy.S
148$(obj)/piggy.S: $(obj)/vmlinux.bin.$(suffix-y) $(obj)/mkpiggy FORCE
149	$(call if_changed,mkpiggy)
150