Makefile

  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)
116AFLAGS_sbat.o += -I $(srctree)
117endif
118
119$(obj)/vmlinux: $(vmlinux-objs-y) $(vmlinux-libs-y) FORCE
120	$(call if_changed,ld)
121
122OBJCOPYFLAGS_vmlinux.bin :=  -R .comment -S
123$(obj)/vmlinux.bin: vmlinux FORCE
124	$(call if_changed,objcopy)
125
126targets += $(patsubst $(obj)/%,%,$(vmlinux-objs-y)) vmlinux.bin.all vmlinux.relocs
127
128CMD_RELOCS = arch/x86/tools/relocs
129quiet_cmd_relocs = RELOCS  $@
130      cmd_relocs = $(CMD_RELOCS) $< > $@;$(CMD_RELOCS) --abs-relocs $<
131
132$(obj)/vmlinux.relocs: vmlinux.unstripped FORCE
133	$(call if_changed,relocs)
134
135vmlinux.bin.all-y := $(obj)/vmlinux.bin
136vmlinux.bin.all-$(CONFIG_X86_NEED_RELOCS) += $(obj)/vmlinux.relocs
137
138$(obj)/vmlinux.bin.gz: $(vmlinux.bin.all-y) FORCE
139	$(call if_changed,gzip)
140$(obj)/vmlinux.bin.bz2: $(vmlinux.bin.all-y) FORCE
141	$(call if_changed,bzip2_with_size)
142$(obj)/vmlinux.bin.lzma: $(vmlinux.bin.all-y) FORCE
143	$(call if_changed,lzma_with_size)
144$(obj)/vmlinux.bin.xz: $(vmlinux.bin.all-y) FORCE
145	$(call if_changed,xzkern_with_size)
146$(obj)/vmlinux.bin.lzo: $(vmlinux.bin.all-y) FORCE
147	$(call if_changed,lzo_with_size)
148$(obj)/vmlinux.bin.lz4: $(vmlinux.bin.all-y) FORCE
149	$(call if_changed,lz4_with_size)
150$(obj)/vmlinux.bin.zst: $(vmlinux.bin.all-y) FORCE
151	$(call if_changed,zstd22_with_size)
152
153suffix-$(CONFIG_KERNEL_GZIP)	:= gz
154suffix-$(CONFIG_KERNEL_BZIP2)	:= bz2
155suffix-$(CONFIG_KERNEL_LZMA)	:= lzma
156suffix-$(CONFIG_KERNEL_XZ)	:= xz
157suffix-$(CONFIG_KERNEL_LZO) 	:= lzo
158suffix-$(CONFIG_KERNEL_LZ4) 	:= lz4
159suffix-$(CONFIG_KERNEL_ZSTD)	:= zst
160
161quiet_cmd_mkpiggy = MKPIGGY $@
162      cmd_mkpiggy = $(obj)/mkpiggy $< > $@
163
164targets += piggy.S
165$(obj)/piggy.S: $(obj)/vmlinux.bin.$(suffix-y) $(obj)/mkpiggy FORCE
166	$(call if_changed,mkpiggy)