[linux-block.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 | sed -e 's/i.86/i386/'),i386)
        KBUILD_DEFCONFIG := i386_defconfig
  else
        KBUILD_DEFCONFIG := x86_64_defconfig
  endif
else
        KBUILD_DEFCONFIG := $(ARCH)_defconfig
endif

ifdef CONFIG_CC_IS_GCC
RETPOLINE_CFLAGS	:= $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register)
RETPOLINE_VDSO_CFLAGS	:= $(call cc-option,-mindirect-branch=thunk-inline -mindirect-branch-register)
endif
ifdef CONFIG_CC_IS_CLANG
RETPOLINE_CFLAGS	:= -mretpoline-external-thunk
RETPOLINE_VDSO_CFLAGS	:= -mretpoline
endif
RETPOLINE_CFLAGS	+= $(call cc-option,-mindirect-branch-cs-prefix)

ifdef CONFIG_RETHUNK
RETHUNK_CFLAGS		:= -mfunction-return=thunk-extern
RETPOLINE_CFLAGS	+= $(RETHUNK_CFLAGS)
endif

export RETHUNK_CFLAGS
export RETPOLINE_CFLAGS
export RETPOLINE_VDSO_CFLAGS

# 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 -D__DISABLE_EXPORTS \
		   -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 += -Wno-address-of-packed-member
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 -mno-avx
KBUILD_RUSTFLAGS += -Ctarget-feature=-sse,-sse2,-sse3,-ssse3,-sse4.1,-sse4.2,-avx,-avx2

ifeq ($(CONFIG_X86_KERNEL_IBT),y)
#
# Kernel IBT has S_CET.NOTRACK_EN=0, as such the compilers must not generate
# NOTRACK prefixes. Current generation compilers unconditionally employ NOTRACK
# for jump-tables, as such, disable jump-tables for now.
#
# (jump-tables are implicitly disabled by RETPOLINE)
#
#   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104816
#
KBUILD_CFLAGS += $(call cc-option,-fcf-protection=branch -fno-jump-tables)
else
KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
endif

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

        KBUILD_AFLAGS += -m32
        KBUILD_CFLAGS += -m32

        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 += $(cc_stack_align4)

        # CPU-specific tuning. Anything which can be shared with UML should go here.
        include $(srctree)/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__

        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 += -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 += $(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-$(CONFIG_MK8)		+= -march=k8
        cflags-$(CONFIG_MPSC)		+= -march=nocona
        cflags-$(CONFIG_MCORE2)		+= -march=core2
        cflags-$(CONFIG_MATOM)		+= -march=atom
        cflags-$(CONFIG_GENERIC_CPU)	+= -mtune=generic
        KBUILD_CFLAGS += $(cflags-y)

        rustflags-$(CONFIG_MK8)		+= -Ctarget-cpu=k8
        rustflags-$(CONFIG_MPSC)	+= -Ctarget-cpu=nocona
        rustflags-$(CONFIG_MCORE2)	+= -Ctarget-cpu=core2
        rustflags-$(CONFIG_MATOM)	+= -Ctarget-cpu=atom
        rustflags-$(CONFIG_GENERIC_CPU)	+= -Ztune-cpu=generic
        KBUILD_RUSTFLAGS += $(rustflags-y)

        KBUILD_CFLAGS += -mno-red-zone
        KBUILD_CFLAGS += -mcmodel=kernel
        KBUILD_RUSTFLAGS += -Cno-redzone=y
        KBUILD_RUSTFLAGS += -Ccode-model=kernel
endif

#
# 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
  endif
endif

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

ifdef CONFIG_SLS
  KBUILD_CFLAGS += -mharden-sls=all
endif

ifdef CONFIG_CALL_PADDING
PADDING_CFLAGS := -fpatchable-function-entry=$(CONFIG_FUNCTION_PADDING_BYTES),$(CONFIG_FUNCTION_PADDING_BYTES)
KBUILD_CFLAGS += $(PADDING_CFLAGS)
export PADDING_CFLAGS
endif

KBUILD_LDFLAGS += -m elf_$(UTS_MACHINE)

ifdef CONFIG_LTO_CLANG
ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y)
KBUILD_LDFLAGS	+= -plugin-opt=-stack-alignment=$(if $(CONFIG_X86_32),4,8)
endif
endif

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

libs-y  += arch/x86/lib/

# 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 hdimage 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
install:
	$(call cmd,install)

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

archprepare: checkbin
checkbin:
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

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  '  hdimage		- Create a BIOS/EFI hard disk image (arch/x86/boot/hdimage)'
  echo  '  isoimage		- Create a boot CD-ROM image (arch/x86/boot/image.iso)'
  echo  '			  bzdisk/fdimage*/hdimage/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'
  echo  '  x86_debug.config	- Enable tip tree debugging options for testing'

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 ($(ARCH),x86)
f9bb7f6a	6	ifeq ($(shell uname -m \| sed -e 's/i.86/i386/'),i386)
d746d647	7	KBUILD_DEFCONFIG := i386_defconfig
f9bb7f6a AB	8	else
f9bb7f6a AB	9	KBUILD_DEFCONFIG := x86_64_defconfig
ffee0de4	10	endif
d746d647 SR	11	else
	12	KBUILD_DEFCONFIG := $(ARCH)_defconfig
	13	endif
2266cfd5	14
b2f825bf PZ	15	ifdef CONFIG_CC_IS_GCC
	16	RETPOLINE_CFLAGS := $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register)
	17	RETPOLINE_VDSO_CFLAGS := $(call cc-option,-mindirect-branch=thunk-inline -mindirect-branch-register)
	18	endif
	19	ifdef CONFIG_CC_IS_CLANG
	20	RETPOLINE_CFLAGS := -mretpoline-external-thunk
	21	RETPOLINE_VDSO_CFLAGS := -mretpoline
	22	endif
27b5de62	23	RETPOLINE_CFLAGS += $(call cc-option,-mindirect-branch-cs-prefix)
f43b9876 PZ	24
	25	ifdef CONFIG_RETHUNK
	26	RETHUNK_CFLAGS := -mfunction-return=thunk-extern
	27	RETPOLINE_CFLAGS += $(RETHUNK_CFLAGS)
	28	endif
	29
efc72a66	30	export RETHUNK_CFLAGS
b2f825bf PZ	31	export RETPOLINE_CFLAGS
	32	export RETPOLINE_VDSO_CFLAGS
	33
d77698df MK	34	# For gcc stack alignment is specified with -mpreferred-stack-boundary,
	35	# clang has the option -mstack-alignment for that purpose.
	36	ifneq ($(call cc-option, -mpreferred-stack-boundary=4),)
8f918697 MK	37	cc_stack_align4 := -mpreferred-stack-boundary=2
	38	cc_stack_align8 := -mpreferred-stack-boundary=3
	39	else ifneq ($(call cc-option, -mstack-alignment=16),)
	40	cc_stack_align4 := -mstack-alignment=4
	41	cc_stack_align8 := -mstack-alignment=8
d77698df MK	42	endif
d77698df MK	43
1c678da3 DW	44	# How to compile the 16-bit code. Note we always compile for -march=i386;
1c678da3 DW	45	# that way we can complain to the user if the CPU is insufficient.
156ff4a5	46	REALMODE_CFLAGS := -m16 -g -Os -DDISABLE_BRANCH_PROFILING -D__DISABLE_EXPORTS \
1c678da3	47	-Wall -Wstrict-prototypes -march=i386 -mregparm=3 \
1c678da3	48	-fno-strict-aliasing -fomit-frame-pointer -fno-pic \
9fcb51c1	49	-mno-mmx -mno-sse $(call cc-option,-fcf-protection=none)
032a2c4f	50
685969e0	51	REALMODE_CFLAGS += -ffreestanding
893ab004	52	REALMODE_CFLAGS += -fno-stack-protector
989ceac7 ND	53	REALMODE_CFLAGS += -Wno-address-of-packed-member
989ceac7 ND	54	REALMODE_CFLAGS += $(cc_stack_align4)
8abe7fc2	55	REALMODE_CFLAGS += $(CLANG_FLAGS)
1c678da3 DW	56	export REALMODE_CFLAGS
1c678da3 DW	57
0a6ef376 SR	58	# BITS is used as extension for files which are available in a 32 bit
	59	# and a 64 bit version to simplify shared Makefiles.
	60	# e.g.: obj-y += foo_$(BITS).o
	61	export BITS
74b469f2	62
b2c51106 AL	63	#
	64	# Prevent GCC from generating any FP code by mistake.
	65	#
	66	# This must happen before we try the -mpreferred-stack-boundary, see:
	67	#
	68	# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383
	69	#
989ceac7	70	KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -mno-avx
09498135	71	KBUILD_RUSTFLAGS += -Ctarget-feature=-sse,-sse2,-sse3,-ssse3,-sse4.1,-sse4.2,-avx,-avx2
b2c51106	72
156ff4a5 PZ	73	ifeq ($(CONFIG_X86_KERNEL_IBT),y)
	74	#
	75	# Kernel IBT has S_CET.NOTRACK_EN=0, as such the compilers must not generate
	76	# NOTRACK prefixes. Current generation compilers unconditionally employ NOTRACK
	77	# for jump-tables, as such, disable jump-tables for now.
	78	#
	79	# (jump-tables are implicitly disabled by RETPOLINE)
	80	#
	81	# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104816
	82	#
	83	KBUILD_CFLAGS += $(call cc-option,-fcf-protection=branch -fno-jump-tables)
	84	else
256b92af	85	KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
156ff4a5	86	endif
256b92af	87
d746d647	88	ifeq ($(CONFIG_X86_32),y)
0a6ef376	89	BITS := 32
8c6531f7	90	UTS_MACHINE := i386
4ba7e5cd	91	CHECKFLAGS += -D__i386__
0a6ef376	92
989ceac7 ND	93	KBUILD_AFLAGS += -m32
989ceac7 ND	94	KBUILD_CFLAGS += -m32
0a6ef376	95
0a6ef376 SR	96	KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
0a6ef376 SR	97
484d90ee AB	98	# Never want PIC in a 32-bit kernel, prevent breakage with GCC built
	99	# with nonstandard options
	100	KBUILD_CFLAGS += -fno-pic
	101
d77698df MK	102	# Align the stack to the register width instead of using the default
	103	# alignment of 16 bytes. This reduces stack usage and the number of
	104	# alignment instructions.
989ceac7	105	KBUILD_CFLAGS += $(cc_stack_align4)
0a6ef376	106
0a6ef376	107	# CPU-specific tuning. Anything which can be shared with UML should go here.
d8285639	108	include $(srctree)/arch/x86/Makefile_32.cpu
0a6ef376 SR	109	KBUILD_CFLAGS += $(cflags-y)
	110
	111	# temporary until string.h is fixed
	112	KBUILD_CFLAGS += -ffreestanding
3fb0fdb3 AL	113
	114	ifeq ($(CONFIG_STACKPROTECTOR),y)
	115	ifeq ($(CONFIG_SMP),y)
	116	KBUILD_CFLAGS += -mstack-protector-guard-reg=fs -mstack-protector-guard-symbol=__stack_chk_guard
	117	else
	118	KBUILD_CFLAGS += -mstack-protector-guard=global
	119	endif
	120	endif
74b469f2	121	else
0a6ef376	122	BITS := 64
8c6531f7	123	UTS_MACHINE := x86_64
1f2f01b1	124	CHECKFLAGS += -D__x86_64__
0a6ef376 SR	125
	126	KBUILD_AFLAGS += -m64
	127	KBUILD_CFLAGS += -m64
	128
be6cb027	129	# Align jump targets to 1 byte, not the default 16 bytes:
2c4fd1ac	130	KBUILD_CFLAGS += $(call cc-option,-falign-jumps=1)
be6cb027	131
52648e83	132	# Pack loops tightly as well:
2c4fd1ac	133	KBUILD_CFLAGS += $(call cc-option,-falign-loops=1)
52648e83	134
5c630089	135	# Don't autogenerate traditional x87 instructions
989ceac7	136	KBUILD_CFLAGS += -mno-80387
8f2dd677	137	KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387)
5551a34e	138
d77698df MK	139	# By default gcc and clang use a stack alignment of 16 bytes for x86.
	140	# However the standard kernel entry on x86-64 leaves the stack on an
	141	# 8-byte boundary. If the compiler isn't informed about the actual
	142	# alignment it will generate extra alignment instructions for the
	143	# default alignment which keep the stack misaligned.
	144	# Furthermore an alignment to the register width reduces stack usage
	145	# and the number of alignment instructions.
989ceac7	146	KBUILD_CFLAGS += $(cc_stack_align8)
d9b0cde9	147
d9ee948d L	148	# Use -mskip-rax-setup if supported.
	149	KBUILD_CFLAGS += $(call cc-option,-mskip-rax-setup)
	150
0a6ef376	151	# FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
989ceac7 ND	152	cflags-$(CONFIG_MK8) += -march=k8
	153	cflags-$(CONFIG_MPSC) += -march=nocona
	154	cflags-$(CONFIG_MCORE2) += -march=core2
	155	cflags-$(CONFIG_MATOM) += -march=atom
	156	cflags-$(CONFIG_GENERIC_CPU) += -mtune=generic
0a6ef376 SR	157	KBUILD_CFLAGS += $(cflags-y)
0a6ef376 SR	158
09498135 MO	159	rustflags-$(CONFIG_MK8) += -Ctarget-cpu=k8
	160	rustflags-$(CONFIG_MPSC) += -Ctarget-cpu=nocona
	161	rustflags-$(CONFIG_MCORE2) += -Ctarget-cpu=core2
	162	rustflags-$(CONFIG_MATOM) += -Ctarget-cpu=atom
	163	rustflags-$(CONFIG_GENERIC_CPU) += -Ztune-cpu=generic
	164	KBUILD_RUSTFLAGS += $(rustflags-y)
	165
0a6ef376 SR	166	KBUILD_CFLAGS += -mno-red-zone
0a6ef376 SR	167	KBUILD_CFLAGS += -mcmodel=kernel
09498135 MO	168	KBUILD_RUSTFLAGS += -Cno-redzone=y
09498135 MO	169	KBUILD_RUSTFLAGS += -Ccode-model=kernel
5d707e9c	170	endif
0a6ef376	171
3f135e57 JP	172	#
	173	# If the function graph tracer is used with mcount instead of fentry,
	174	# '-maccumulate-outgoing-args' is needed to prevent a GCC bug
	175	# (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42109)
	176	#
	177	ifdef CONFIG_FUNCTION_GRAPH_TRACER
	178	ifndef CONFIG_HAVE_FENTRY
	179	ACCUMULATE_OUTGOING_ARGS := 1
3f135e57 JP	180	endif
	181	endif
	182
3f135e57	183	ifeq ($(ACCUMULATE_OUTGOING_ARGS), 1)
4a1bec46 ND	184	# This compiler flag is not supported by Clang:
4a1bec46 ND	185	KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args,)
3f135e57 JP	186	endif
3f135e57 JP	187
25dfeeb7 SR	188	# Workaround for a gcc prelease that unfortunately was shipped in a suse release
	189	KBUILD_CFLAGS += -Wno-sign-compare
	190	#
	191	KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
0a6ef376	192
76b04384 DW	193	# Avoid indirect branches in kernel to deal with Spectre
76b04384 DW	194	ifdef CONFIG_RETPOLINE
4cd24de3	195	KBUILD_CFLAGS += $(RETPOLINE_CFLAGS)
ce02ef06 DB	196	# Additionally, avoid generating expensive indirect jumps which
	197	# are subject to retpolines for small number of switch cases.
	198	# clang turns off jump table generation by default when under
a9d57ef1 DB	199	# retpoline builds, however, gcc does not for x86. This has
	200	# only been fixed starting from gcc stable version 8.4.0 and
	201	# onwards, but not for older ones. See gcc bug #86952.
	202	ifndef CONFIG_CC_IS_CLANG
989ceac7	203	KBUILD_CFLAGS += -fno-jump-tables
a9d57ef1	204	endif
76b04384 DW	205	endif
76b04384 DW	206
e463a09a PZ	207	ifdef CONFIG_SLS
	208	KBUILD_CFLAGS += -mharden-sls=all
	209	endif
	210
931ab636	211	ifdef CONFIG_CALL_PADDING
bea75b33 TG	212	PADDING_CFLAGS := -fpatchable-function-entry=$(CONFIG_FUNCTION_PADDING_BYTES),$(CONFIG_FUNCTION_PADDING_BYTES)
	213	KBUILD_CFLAGS += $(PADDING_CFLAGS)
	214	export PADDING_CFLAGS
	215	endif
	216
0024430e NC	217	KBUILD_LDFLAGS += -m elf_$(UTS_MACHINE)
	218
	219	ifdef CONFIG_LTO_CLANG
fccb3d3e	220	ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y)
2398ce80 TV	221	KBUILD_LDFLAGS += -plugin-opt=-stack-alignment=$(if $(CONFIG_X86_32),4,8)
2398ce80 TV	222	endif
0024430e	223	endif
587af649 AS	224
	225	ifdef CONFIG_X86_NEED_RELOCS
	226	LDFLAGS_vmlinux := --emit-relocs --discard-none
	227	else
	228	LDFLAGS_vmlinux :=
	229	endif
	230
	231	#
	232	# The 64-bit kernel must be aligned to 2MB. Pass -z max-page-size=0x200000 to
	233	# the linker to force 2MB page size regardless of the default page size used
	234	# by the linker.
	235	#
	236	ifdef CONFIG_X86_64
	237	LDFLAGS_vmlinux += -z max-page-size=0x200000
	238	endif
	239
83109d5d	240
3ce9e53e	241	archscripts: scripts_basic
6520fe55 PA	242	$(Q)$(MAKE) $(build)=arch/x86/tools relocs
6520fe55 PA	243
303395ac PA	244	###
	245	# Syscall table generation
	246
	247	archheaders:
1f57d5d8	248	$(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all
303395ac	249
0a6ef376 SR	250	###
	251	# Kernel objects
	252
0a6ef376 SR	253	libs-y += arch/x86/lib/
0a6ef376 SR	254
0a6ef376 SR	255	# drivers-y are linked after core-y
	256	drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
	257	drivers-$(CONFIG_PCI) += arch/x86/pci/
	258
cf7700fe	259	# suspend and hibernation support
0a6ef376	260	drivers-$(CONFIG_PM) += arch/x86/power/
cf7700fe	261
0a6ef376	262	drivers-$(CONFIG_FB) += arch/x86/video/
0a6ef376 SR	263
	264	####
	265	# boot loader support. Several targets are kept for legacy purposes
	266
	267	boot := arch/x86/boot
	268
f279b49f	269	BOOT_TARGETS = bzdisk fdimage fdimage144 fdimage288 hdimage isoimage
f9c5107c PA	270
f9c5107c PA	271	PHONY += bzImage $(BOOT_TARGETS)
0a6ef376 SR	272
	273	# Default kernel to build
	274	all: bzImage
	275
	276	# KBUILD_IMAGE specify target image being built
f9c5107c	277	KBUILD_IMAGE := $(boot)/bzImage
0a6ef376	278
f9c5107c	279	bzImage: vmlinux
ca0e9bad MH	280	ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
	281	$(Q)$(MAKE) $(build)=arch/x86/tools posttest
	282	endif
0a6ef376 SR	283	$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
0a6ef376 SR	284	$(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
41b3eae6	285	$(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
0a6ef376	286
f9c5107c PA	287	$(BOOT_TARGETS): vmlinux
f9c5107c PA	288	$(Q)$(MAKE) $(build)=$(boot) $@
0a6ef376	289
6d61b8e6 MY	290	PHONY += install
6d61b8e6 MY	291	install:
f774f5bb	292	$(call cmd,install)
1648e4f8	293
0a6ef376 SR	294	PHONY += vdso_install
0a6ef376 SR	295	vdso_install:
d603c8e1	296	$(Q)$(MAKE) $(build)=arch/x86/entry/vdso $@
0a6ef376	297
829fe4aa BH	298	archprepare: checkbin
829fe4aa BH	299	checkbin:
25896d07 MY	300	ifdef CONFIG_RETPOLINE
	301	ifeq ($(RETPOLINE_CFLAGS),)
	302	@echo "You are building kernel with non-retpoline compiler." >&2
	303	@echo "Please update your compiler." >&2
	304	@false
	305	endif
	306	endif
829fe4aa	307
0a6ef376 SR	308	archclean:
	309	$(Q)rm -rf $(objtree)/arch/i386
	310	$(Q)rm -rf $(objtree)/arch/x86_64
0a6ef376 SR	311
0a6ef376 SR	312	define archhelp
ac5d0887 BP	313	echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)'
	314	echo ' install - Install kernel using (your) ~/bin/$(INSTALLKERNEL) or'
	315	echo ' (distribution) /sbin/$(INSTALLKERNEL) or install to '
	316	echo ' $$(INSTALL_PATH) and run lilo'
	317	echo ''
	318	echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
	319	echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
	320	echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
f279b49f	321	echo ' hdimage - Create a BIOS/EFI hard disk image (arch/x86/boot/hdimage)'
ac5d0887	322	echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
f279b49f	323	echo ' bzdisk/fdimage*/hdimage/isoimage also accept:'
ac5d0887	324	echo ' FDARGS="..." arguments for the booted kernel'
a757ac55	325	echo ' FDINITRD=file initrd for the booted kernel'
ac5d0887 BP	326	echo ''
	327	echo ' kvm_guest.config - Enable Kconfig items for running this kernel as a KVM guest'
	328	echo ' xen.config - Enable Kconfig items for running this kernel as a Xen guest'
9b5a7f4a	329	echo ' x86_debug.config - Enable tip tree debugging options for testing'
fbaf0aa8	330
0a6ef376	331	endef