[mirror_ubuntu-jammy-kernel.git] / arch / x86 / Makefile

# SPDX-License-Identifier: GPL-2.0
# Unified Makefile for i386 and x86_64

# select defconfig based on actual architecture
ifeq ($(ARCH),x86)
  ifeq ($(shell uname -m),x86_64)
        KBUILD_DEFCONFIG := x86_64_defconfig
  else
        KBUILD_DEFCONFIG := i386_defconfig
  endif
else
        KBUILD_DEFCONFIG := $(ARCH)_defconfig
endif

# For gcc stack alignment is specified with -mpreferred-stack-boundary,
# clang has the option -mstack-alignment for that purpose.
ifneq ($(call cc-option, -mpreferred-stack-boundary=4),)
      cc_stack_align4 := -mpreferred-stack-boundary=2
      cc_stack_align8 := -mpreferred-stack-boundary=3
else ifneq ($(call cc-option, -mstack-alignment=16),)
      cc_stack_align4 := -mstack-alignment=4
      cc_stack_align8 := -mstack-alignment=8
endif

# How to compile the 16-bit code.  Note we always compile for -march=i386;
# that way we can complain to the user if the CPU is insufficient.
REALMODE_CFLAGS	:= -m16 -g -Os -DDISABLE_BRANCH_PROFILING \
		   -Wall -Wstrict-prototypes -march=i386 -mregparm=3 \
		   -fno-strict-aliasing -fomit-frame-pointer -fno-pic \
		   -mno-mmx -mno-sse $(call cc-option,-fcf-protection=none)

REALMODE_CFLAGS += -ffreestanding
REALMODE_CFLAGS += -fno-stack-protector
REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -Wno-address-of-packed-member)
REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), $(cc_stack_align4))
REALMODE_CFLAGS += $(CLANG_FLAGS)
export REALMODE_CFLAGS

# BITS is used as extension for files which are available in a 32 bit
# and a 64 bit version to simplify shared Makefiles.
# e.g.: obj-y += foo_$(BITS).o
export BITS

#
# Prevent GCC from generating any FP code by mistake.
#
# This must happen before we try the -mpreferred-stack-boundary, see:
#
#    https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383
#
KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow
KBUILD_CFLAGS += $(call cc-option,-mno-avx,)

# Intel CET isn't enabled in the kernel
KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)

ifeq ($(CONFIG_X86_32),y)
        BITS := 32
        UTS_MACHINE := i386
        CHECKFLAGS += -D__i386__

        biarch := $(call cc-option,-m32)
        KBUILD_AFLAGS += $(biarch)
        KBUILD_CFLAGS += $(biarch)

        KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return

        # Never want PIC in a 32-bit kernel, prevent breakage with GCC built
        # with nonstandard options
        KBUILD_CFLAGS += -fno-pic

        # Align the stack to the register width instead of using the default
        # alignment of 16 bytes. This reduces stack usage and the number of
        # alignment instructions.
        KBUILD_CFLAGS += $(call cc-option,$(cc_stack_align4))

        # CPU-specific tuning. Anything which can be shared with UML should go here.
        include arch/x86/Makefile_32.cpu
        KBUILD_CFLAGS += $(cflags-y)

        # temporary until string.h is fixed
        KBUILD_CFLAGS += -ffreestanding

	ifeq ($(CONFIG_STACKPROTECTOR),y)
		ifeq ($(CONFIG_SMP),y)
			KBUILD_CFLAGS += -mstack-protector-guard-reg=fs -mstack-protector-guard-symbol=__stack_chk_guard
		else
			KBUILD_CFLAGS += -mstack-protector-guard=global
		endif
	endif
else
        BITS := 64
        UTS_MACHINE := x86_64
        CHECKFLAGS += -D__x86_64__

        biarch := -m64
        KBUILD_AFLAGS += -m64
        KBUILD_CFLAGS += -m64

        # Align jump targets to 1 byte, not the default 16 bytes:
        KBUILD_CFLAGS += $(call cc-option,-falign-jumps=1)

        # Pack loops tightly as well:
        KBUILD_CFLAGS += $(call cc-option,-falign-loops=1)

        # Don't autogenerate traditional x87 instructions
        KBUILD_CFLAGS += $(call cc-option,-mno-80387)
        KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387)

        # By default gcc and clang use a stack alignment of 16 bytes for x86.
        # However the standard kernel entry on x86-64 leaves the stack on an
        # 8-byte boundary. If the compiler isn't informed about the actual
        # alignment it will generate extra alignment instructions for the
        # default alignment which keep the stack *mis*aligned.
        # Furthermore an alignment to the register width reduces stack usage
        # and the number of alignment instructions.
        KBUILD_CFLAGS += $(call cc-option,$(cc_stack_align8))

	# Use -mskip-rax-setup if supported.
	KBUILD_CFLAGS += $(call cc-option,-mskip-rax-setup)

        # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
        cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
        cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)

        cflags-$(CONFIG_MCORE2) += \
                $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
	cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
		$(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
        cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
        KBUILD_CFLAGS += $(cflags-y)

        KBUILD_CFLAGS += -mno-red-zone
        KBUILD_CFLAGS += -mcmodel=kernel
endif

ifdef CONFIG_X86_X32
	x32_ld_ok := $(call try-run,\
			/bin/echo -e '1: .quad 1b' | \
			$(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \
			$(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMP.o" && \
			$(LD) -m elf32_x86_64 "$$TMP.o" -o "$$TMP",y,n)
        ifeq ($(x32_ld_ok),y)
                CONFIG_X86_X32_ABI := y
                KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
                KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
        else
                $(warning CONFIG_X86_X32 enabled but no binutils support)
        endif
endif
export CONFIG_X86_X32_ABI

#
# If the function graph tracer is used with mcount instead of fentry,
# '-maccumulate-outgoing-args' is needed to prevent a GCC bug
# (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42109)
#
ifdef CONFIG_FUNCTION_GRAPH_TRACER
  ifndef CONFIG_HAVE_FENTRY
	ACCUMULATE_OUTGOING_ARGS := 1
  else
    ifeq ($(call cc-option-yn, -mfentry), n)
	ACCUMULATE_OUTGOING_ARGS := 1

	# GCC ignores '-maccumulate-outgoing-args' when used with '-Os'.
	# If '-Os' is enabled, disable it and print a warning.
        ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
          undefine CONFIG_CC_OPTIMIZE_FOR_SIZE
          $(warning Disabling CONFIG_CC_OPTIMIZE_FOR_SIZE.  Your compiler does not have -mfentry so you cannot optimize for size with CONFIG_FUNCTION_GRAPH_TRACER.)
        endif

    endif
  endif
endif

ifeq ($(ACCUMULATE_OUTGOING_ARGS), 1)
	# This compiler flag is not supported by Clang:
	KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args,)
endif

ifdef CONFIG_LTO_CLANG
KBUILD_LDFLAGS	+= -plugin-opt=-code-model=kernel \
		   -plugin-opt=-stack-alignment=$(if $(CONFIG_X86_32),4,8)
endif

# Workaround for a gcc prelease that unfortunately was shipped in a suse release
KBUILD_CFLAGS += -Wno-sign-compare
#
KBUILD_CFLAGS += -fno-asynchronous-unwind-tables

# Avoid indirect branches in kernel to deal with Spectre
ifdef CONFIG_RETPOLINE
  KBUILD_CFLAGS += $(RETPOLINE_CFLAGS)
  # Additionally, avoid generating expensive indirect jumps which
  # are subject to retpolines for small number of switch cases.
  # clang turns off jump table generation by default when under
  # retpoline builds, however, gcc does not for x86. This has
  # only been fixed starting from gcc stable version 8.4.0 and
  # onwards, but not for older ones. See gcc bug #86952.
  ifndef CONFIG_CC_IS_CLANG
    KBUILD_CFLAGS += $(call cc-option,-fno-jump-tables)
  endif
endif

KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE)

ifdef CONFIG_X86_NEED_RELOCS
LDFLAGS_vmlinux := --emit-relocs --discard-none
else
LDFLAGS_vmlinux :=
endif

#
# The 64-bit kernel must be aligned to 2MB.  Pass -z max-page-size=0x200000 to
# the linker to force 2MB page size regardless of the default page size used
# by the linker.
#
ifdef CONFIG_X86_64
LDFLAGS_vmlinux += -z max-page-size=0x200000
endif


archscripts: scripts_basic
	$(Q)$(MAKE) $(build)=arch/x86/tools relocs

###
# Syscall table generation

archheaders:
	$(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all

###
# Kernel objects

head-y := arch/x86/kernel/head_$(BITS).o
head-y += arch/x86/kernel/head$(BITS).o
head-y += arch/x86/kernel/ebda.o
head-y += arch/x86/kernel/platform-quirks.o

libs-y  += arch/x86/lib/

# See arch/x86/Kbuild for content of core part of the kernel
core-y += arch/x86/

# drivers-y are linked after core-y
drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
drivers-$(CONFIG_PCI)            += arch/x86/pci/

# suspend and hibernation support
drivers-$(CONFIG_PM) += arch/x86/power/

drivers-$(CONFIG_FB) += arch/x86/video/

####
# boot loader support. Several targets are kept for legacy purposes

boot := arch/x86/boot

BOOT_TARGETS = bzdisk fdimage fdimage144 fdimage288 isoimage

PHONY += bzImage $(BOOT_TARGETS)

# Default kernel to build
all: bzImage

# KBUILD_IMAGE specify target image being built
KBUILD_IMAGE := $(boot)/bzImage

bzImage: vmlinux
ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
	$(Q)$(MAKE) $(build)=arch/x86/tools posttest
endif
	$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
	$(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
	$(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@

$(BOOT_TARGETS): vmlinux
	$(Q)$(MAKE) $(build)=$(boot) $@

PHONY += install bzlilo
install bzlilo:
	$(Q)$(MAKE) $(build)=$(boot) $@

PHONY += vdso_install
vdso_install:
	$(Q)$(MAKE) $(build)=arch/x86/entry/vdso $@

archprepare: checkbin
checkbin:
ifndef CONFIG_CC_HAS_ASM_GOTO
	@echo Compiler lacks asm-goto support.
	@exit 1
endif
ifdef CONFIG_RETPOLINE
ifeq ($(RETPOLINE_CFLAGS),)
	@echo "You are building kernel with non-retpoline compiler." >&2
	@echo "Please update your compiler." >&2
	@false
endif
endif

archclean:
	$(Q)rm -rf $(objtree)/arch/i386
	$(Q)rm -rf $(objtree)/arch/x86_64
	$(Q)$(MAKE) $(clean)=$(boot)
	$(Q)$(MAKE) $(clean)=arch/x86/tools

define archhelp
  echo  '* bzImage		- Compressed kernel image (arch/x86/boot/bzImage)'
  echo  '  install		- Install kernel using (your) ~/bin/$(INSTALLKERNEL) or'
  echo  '			  (distribution) /sbin/$(INSTALLKERNEL) or install to '
  echo  '			  $$(INSTALL_PATH) and run lilo'
  echo  ''
  echo  '  fdimage		- Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
  echo  '  fdimage144		- Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
  echo  '  fdimage288		- Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
  echo  '  isoimage		- Create a boot CD-ROM image (arch/x86/boot/image.iso)'
  echo  '			  bzdisk/fdimage*/isoimage also accept:'
  echo  '			  FDARGS="..."  arguments for the booted kernel'
  echo  '                  	  FDINITRD=file initrd for the booted kernel'
  echo  ''
  echo  '  kvm_guest.config	- Enable Kconfig items for running this kernel as a KVM guest'
  echo  '  xen.config		- Enable Kconfig items for running this kernel as a Xen guest'

endef
Commit	Line	Data
b2441318	1	# SPDX-License-Identifier: GPL-2.0
74b469f2 SR	2	# Unified Makefile for i386 and x86_64
74b469f2 SR	3
2266cfd5	4	# select defconfig based on actual architecture
d746d647	5	ifeq ($(ARCH),x86)
ffee0de4 DW	6	ifeq ($(shell uname -m),x86_64)
	7	KBUILD_DEFCONFIG := x86_64_defconfig
	8	else
d746d647	9	KBUILD_DEFCONFIG := i386_defconfig
ffee0de4	10	endif
d746d647 SR	11	else
	12	KBUILD_DEFCONFIG := $(ARCH)_defconfig
	13	endif
2266cfd5	14
d77698df MK	15	# For gcc stack alignment is specified with -mpreferred-stack-boundary,
	16	# clang has the option -mstack-alignment for that purpose.
	17	ifneq ($(call cc-option, -mpreferred-stack-boundary=4),)
8f918697 MK	18	cc_stack_align4 := -mpreferred-stack-boundary=2
	19	cc_stack_align8 := -mpreferred-stack-boundary=3
	20	else ifneq ($(call cc-option, -mstack-alignment=16),)
	21	cc_stack_align4 := -mstack-alignment=4
	22	cc_stack_align8 := -mstack-alignment=8
d77698df MK	23	endif
d77698df MK	24
1c678da3 DW	25	# How to compile the 16-bit code. Note we always compile for -march=i386;
1c678da3 DW	26	# that way we can complain to the user if the CPU is insufficient.
2838307b	27	REALMODE_CFLAGS := -m16 -g -Os -DDISABLE_BRANCH_PROFILING \
1c678da3	28	-Wall -Wstrict-prototypes -march=i386 -mregparm=3 \
1c678da3	29	-fno-strict-aliasing -fomit-frame-pointer -fno-pic \
9fcb51c1	30	-mno-mmx -mno-sse $(call cc-option,-fcf-protection=none)
032a2c4f	31
685969e0	32	REALMODE_CFLAGS += -ffreestanding
893ab004	33	REALMODE_CFLAGS += -fno-stack-protector
42e0e954	34	REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -Wno-address-of-packed-member)
9e8730b1	35	REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), $(cc_stack_align4))
8abe7fc2	36	REALMODE_CFLAGS += $(CLANG_FLAGS)
1c678da3 DW	37	export REALMODE_CFLAGS
1c678da3 DW	38
0a6ef376 SR	39	# BITS is used as extension for files which are available in a 32 bit
	40	# and a 64 bit version to simplify shared Makefiles.
	41	# e.g.: obj-y += foo_$(BITS).o
	42	export BITS
74b469f2	43
b2c51106 AL	44	#
	45	# Prevent GCC from generating any FP code by mistake.
	46	#
	47	# This must happen before we try the -mpreferred-stack-boundary, see:
	48	#
	49	# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383
	50	#
	51	KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow
	52	KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
	53
256b92af BP	54	# Intel CET isn't enabled in the kernel
	55	KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
	56
d746d647	57	ifeq ($(CONFIG_X86_32),y)
0a6ef376	58	BITS := 32
8c6531f7	59	UTS_MACHINE := i386
4ba7e5cd	60	CHECKFLAGS += -D__i386__
0a6ef376	61
4ba7e5cd SR	62	biarch := $(call cc-option,-m32)
	63	KBUILD_AFLAGS += $(biarch)
	64	KBUILD_CFLAGS += $(biarch)
0a6ef376	65
0a6ef376 SR	66	KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
0a6ef376 SR	67
484d90ee AB	68	# Never want PIC in a 32-bit kernel, prevent breakage with GCC built
	69	# with nonstandard options
	70	KBUILD_CFLAGS += -fno-pic
	71
d77698df MK	72	# Align the stack to the register width instead of using the default
	73	# alignment of 16 bytes. This reduces stack usage and the number of
	74	# alignment instructions.
9e8730b1	75	KBUILD_CFLAGS += $(call cc-option,$(cc_stack_align4))
0a6ef376	76
0a6ef376	77	# CPU-specific tuning. Anything which can be shared with UML should go here.
a436bb7b	78	include arch/x86/Makefile_32.cpu
0a6ef376 SR	79	KBUILD_CFLAGS += $(cflags-y)
	80
	81	# temporary until string.h is fixed
	82	KBUILD_CFLAGS += -ffreestanding
3fb0fdb3 AL	83
	84	ifeq ($(CONFIG_STACKPROTECTOR),y)
	85	ifeq ($(CONFIG_SMP),y)
	86	KBUILD_CFLAGS += -mstack-protector-guard-reg=fs -mstack-protector-guard-symbol=__stack_chk_guard
	87	else
	88	KBUILD_CFLAGS += -mstack-protector-guard=global
	89	endif
	90	endif
74b469f2	91	else
0a6ef376	92	BITS := 64
8c6531f7	93	UTS_MACHINE := x86_64
1f2f01b1	94	CHECKFLAGS += -D__x86_64__
0a6ef376	95
14262d67	96	biarch := -m64
0a6ef376 SR	97	KBUILD_AFLAGS += -m64
	98	KBUILD_CFLAGS += -m64
	99
be6cb027	100	# Align jump targets to 1 byte, not the default 16 bytes:
2c4fd1ac	101	KBUILD_CFLAGS += $(call cc-option,-falign-jumps=1)
be6cb027	102
52648e83	103	# Pack loops tightly as well:
2c4fd1ac	104	KBUILD_CFLAGS += $(call cc-option,-falign-loops=1)
52648e83	105
5c630089	106	# Don't autogenerate traditional x87 instructions
8f2dd677 BW	107	KBUILD_CFLAGS += $(call cc-option,-mno-80387)
8f2dd677 BW	108	KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387)
5551a34e	109
d77698df MK	110	# By default gcc and clang use a stack alignment of 16 bytes for x86.
	111	# However the standard kernel entry on x86-64 leaves the stack on an
	112	# 8-byte boundary. If the compiler isn't informed about the actual
	113	# alignment it will generate extra alignment instructions for the
	114	# default alignment which keep the stack misaligned.
	115	# Furthermore an alignment to the register width reduces stack usage
	116	# and the number of alignment instructions.
9e8730b1	117	KBUILD_CFLAGS += $(call cc-option,$(cc_stack_align8))
d9b0cde9	118
d9ee948d L	119	# Use -mskip-rax-setup if supported.
	120	KBUILD_CFLAGS += $(call cc-option,-mskip-rax-setup)
	121
0a6ef376 SR	122	# FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
	123	cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
	124	cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
	125
	126	cflags-$(CONFIG_MCORE2) += \
	127	$(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
366d19e1 TD	128	cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
366d19e1 TD	129	$(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
0a6ef376 SR	130	cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
	131	KBUILD_CFLAGS += $(cflags-y)
	132
	133	KBUILD_CFLAGS += -mno-red-zone
	134	KBUILD_CFLAGS += -mcmodel=kernel
5d707e9c	135	endif
0a6ef376	136
0bf62763 PA	137	ifdef CONFIG_X86_X32
	138	x32_ld_ok := $(call try-run,\
	139	/bin/echo -e '1: .quad 1b' \| \
b1e0d8b7	140	$(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \
e3456056 MY	141	$(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMP.o" && \
e3456056 MY	142	$(LD) -m elf32_x86_64 "$$TMP.o" -o "$$TMP",y,n)
8bd69c2d IM	143	ifeq ($(x32_ld_ok),y)
	144	CONFIG_X86_X32_ABI := y
	145	KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
	146	KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
	147	else
	148	$(warning CONFIG_X86_X32 enabled but no binutils support)
	149	endif
0bf62763 PA	150	endif
	151	export CONFIG_X86_X32_ABI
	152
3f135e57 JP	153	#
	154	# If the function graph tracer is used with mcount instead of fentry,
	155	# '-maccumulate-outgoing-args' is needed to prevent a GCC bug
	156	# (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42109)
	157	#
	158	ifdef CONFIG_FUNCTION_GRAPH_TRACER
	159	ifndef CONFIG_HAVE_FENTRY
	160	ACCUMULATE_OUTGOING_ARGS := 1
	161	else
	162	ifeq ($(call cc-option-yn, -mfentry), n)
	163	ACCUMULATE_OUTGOING_ARGS := 1
a5859c6d JP	164
	165	# GCC ignores '-maccumulate-outgoing-args' when used with '-Os'.
	166	# If '-Os' is enabled, disable it and print a warning.
	167	ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
	168	undefine CONFIG_CC_OPTIMIZE_FOR_SIZE
7e609120	169	$(warning Disabling CONFIG_CC_OPTIMIZE_FOR_SIZE. Your compiler does not have -mfentry so you cannot optimize for size with CONFIG_FUNCTION_GRAPH_TRACER.)
a5859c6d JP	170	endif
a5859c6d JP	171
3f135e57 JP	172	endif
	173	endif
	174	endif
	175
3f135e57	176	ifeq ($(ACCUMULATE_OUTGOING_ARGS), 1)
4a1bec46 ND	177	# This compiler flag is not supported by Clang:
4a1bec46 ND	178	KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args,)
3f135e57 JP	179	endif
3f135e57 JP	180
b33fff07 ST	181	ifdef CONFIG_LTO_CLANG
	182	KBUILD_LDFLAGS += -plugin-opt=-code-model=kernel \
	183	-plugin-opt=-stack-alignment=$(if $(CONFIG_X86_32),4,8)
	184	endif
3f135e57	185
25dfeeb7 SR	186	# Workaround for a gcc prelease that unfortunately was shipped in a suse release
	187	KBUILD_CFLAGS += -Wno-sign-compare
	188	#
	189	KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
0a6ef376	190
76b04384 DW	191	# Avoid indirect branches in kernel to deal with Spectre
76b04384 DW	192	ifdef CONFIG_RETPOLINE
4cd24de3	193	KBUILD_CFLAGS += $(RETPOLINE_CFLAGS)
ce02ef06 DB	194	# Additionally, avoid generating expensive indirect jumps which
	195	# are subject to retpolines for small number of switch cases.
	196	# clang turns off jump table generation by default when under
a9d57ef1 DB	197	# retpoline builds, however, gcc does not for x86. This has
	198	# only been fixed starting from gcc stable version 8.4.0 and
	199	# onwards, but not for older ones. See gcc bug #86952.
	200	ifndef CONFIG_CC_IS_CLANG
	201	KBUILD_CFLAGS += $(call cc-option,-fno-jump-tables)
	202	endif
76b04384 DW	203	endif
76b04384 DW	204
587af649 AS	205	KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE)
	206
	207	ifdef CONFIG_X86_NEED_RELOCS
	208	LDFLAGS_vmlinux := --emit-relocs --discard-none
	209	else
	210	LDFLAGS_vmlinux :=
	211	endif
	212
	213	#
	214	# The 64-bit kernel must be aligned to 2MB. Pass -z max-page-size=0x200000 to
	215	# the linker to force 2MB page size regardless of the default page size used
	216	# by the linker.
	217	#
	218	ifdef CONFIG_X86_64
	219	LDFLAGS_vmlinux += -z max-page-size=0x200000
	220	endif
	221
83109d5d	222
3ce9e53e	223	archscripts: scripts_basic
6520fe55 PA	224	$(Q)$(MAKE) $(build)=arch/x86/tools relocs
6520fe55 PA	225
303395ac PA	226	###
	227	# Syscall table generation
	228
	229	archheaders:
1f57d5d8	230	$(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all
303395ac	231
0a6ef376 SR	232	###
	233	# Kernel objects
	234
700efc1b EB	235	head-y := arch/x86/kernel/head_$(BITS).o
700efc1b EB	236	head-y += arch/x86/kernel/head$(BITS).o
f2d85299	237	head-y += arch/x86/kernel/ebda.o
8d152e7a	238	head-y += arch/x86/kernel/platform-quirks.o
0a6ef376 SR	239
	240	libs-y += arch/x86/lib/
	241
d1f0ae5e SR	242	# See arch/x86/Kbuild for content of core part of the kernel
d1f0ae5e SR	243	core-y += arch/x86/
0a6ef376 SR	244
	245	# drivers-y are linked after core-y
	246	drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
	247	drivers-$(CONFIG_PCI) += arch/x86/pci/
	248
cf7700fe	249	# suspend and hibernation support
0a6ef376	250	drivers-$(CONFIG_PM) += arch/x86/power/
cf7700fe	251
0a6ef376	252	drivers-$(CONFIG_FB) += arch/x86/video/
0a6ef376 SR	253
	254	####
	255	# boot loader support. Several targets are kept for legacy purposes
	256
	257	boot := arch/x86/boot
	258
30ce434e	259	BOOT_TARGETS = bzdisk fdimage fdimage144 fdimage288 isoimage
f9c5107c PA	260
f9c5107c PA	261	PHONY += bzImage $(BOOT_TARGETS)
0a6ef376 SR	262
	263	# Default kernel to build
	264	all: bzImage
	265
	266	# KBUILD_IMAGE specify target image being built
f9c5107c	267	KBUILD_IMAGE := $(boot)/bzImage
0a6ef376	268
f9c5107c	269	bzImage: vmlinux
ca0e9bad MH	270	ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
	271	$(Q)$(MAKE) $(build)=arch/x86/tools posttest
	272	endif
0a6ef376 SR	273	$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
0a6ef376 SR	274	$(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
41b3eae6	275	$(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
0a6ef376	276
f9c5107c PA	277	$(BOOT_TARGETS): vmlinux
f9c5107c PA	278	$(Q)$(MAKE) $(build)=$(boot) $@
0a6ef376	279
30ce434e MY	280	PHONY += install bzlilo
30ce434e MY	281	install bzlilo:
1648e4f8 PA	282	$(Q)$(MAKE) $(build)=$(boot) $@
1648e4f8 PA	283
0a6ef376 SR	284	PHONY += vdso_install
0a6ef376 SR	285	vdso_install:
d603c8e1	286	$(Q)$(MAKE) $(build)=arch/x86/entry/vdso $@
0a6ef376	287
829fe4aa BH	288	archprepare: checkbin
829fe4aa BH	289	checkbin:
e9666d10	290	ifndef CONFIG_CC_HAS_ASM_GOTO
829fe4aa BH	291	@echo Compiler lacks asm-goto support.
	292	@exit 1
	293	endif
25896d07 MY	294	ifdef CONFIG_RETPOLINE
	295	ifeq ($(RETPOLINE_CFLAGS),)
	296	@echo "You are building kernel with non-retpoline compiler." >&2
	297	@echo "Please update your compiler." >&2
	298	@false
	299	endif
	300	endif
829fe4aa	301
0a6ef376 SR	302	archclean:
	303	$(Q)rm -rf $(objtree)/arch/i386
	304	$(Q)rm -rf $(objtree)/arch/x86_64
	305	$(Q)$(MAKE) $(clean)=$(boot)
b2d668da	306	$(Q)$(MAKE) $(clean)=arch/x86/tools
0a6ef376 SR	307
0a6ef376 SR	308	define archhelp
ac5d0887 BP	309	echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)'
	310	echo ' install - Install kernel using (your) ~/bin/$(INSTALLKERNEL) or'
	311	echo ' (distribution) /sbin/$(INSTALLKERNEL) or install to '
	312	echo ' $$(INSTALL_PATH) and run lilo'
	313	echo ''
	314	echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
	315	echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
	316	echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
	317	echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
	318	echo ' bzdisk/fdimage*/isoimage also accept:'
	319	echo ' FDARGS="..." arguments for the booted kernel'
	320	echo ' FDINITRD=file initrd for the booted kernel'
	321	echo ''
	322	echo ' kvm_guest.config - Enable Kconfig items for running this kernel as a KVM guest'
	323	echo ' xen.config - Enable Kconfig items for running this kernel as a Xen guest'
fbaf0aa8	324
0a6ef376	325	endef