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

# 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 ($(call cc-option, -mpreferred-stack-boundary=4),)
        cc_stack_align_opt := -mpreferred-stack-boundary
else ifneq ($(call cc-option, -mstack-alignment=4),)
        cc_stack_align_opt := -mstack-alignment
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.
#
# The -m16 option is supported by GCC >= 4.9 and clang >= 3.5. For
# older versions of GCC, include an *assembly* header to make sure that
# gcc doesn't play any games behind our back.
CODE16GCC_CFLAGS := -m32 -Wa,$(srctree)/arch/x86/boot/code16gcc.h
M16_CFLAGS	 := $(call cc-option, -m16, $(CODE16GCC_CFLAGS))

REALMODE_CFLAGS	:= $(M16_CFLAGS) -g -Os -D__KERNEL__ \
		   -DDISABLE_BRANCH_PROFILING \
		   -Wall -Wstrict-prototypes -march=i386 -mregparm=3 \
		   -fno-strict-aliasing -fomit-frame-pointer -fno-pic \
		   -mno-mmx -mno-sse

REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -ffreestanding)
REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -fno-stack-protector)
REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), $(cc_stack_align_opt)=2)
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

ifdef CONFIG_X86_NEED_RELOCS
        LDFLAGS_vmlinux := --emit-relocs
endif

#
# 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,)

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_align_opt)=2)

        # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
        # a lot more stack due to the lack of sharing of stacklots:
        KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \
				$(call cc-option,-fno-unit-at-a-time))

        # 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
else
        BITS := 64
        UTS_MACHINE := x86_64
        CHECKFLAGS += -D__x86_64__ -m64

        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_align_opt)=3)

	# 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

        # -funit-at-a-time shrinks the kernel .text considerably
        # unfortunately it makes reading oopses harder.
        KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
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" "$$TMPO" && \
			$(LD) -m elf32_x86_64 "$$TMPO" -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

# Don't unroll struct assignments with kmemcheck enabled
ifeq ($(CONFIG_KMEMCHECK),y)
	KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
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
  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

#
# Jump labels need '-maccumulate-outgoing-args' for gcc < 4.5.2 to prevent a
# GCC bug (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46226).  There's no way
# to test for this bug at compile-time because the test case needs to execute,
# which is a no-go for cross compilers.  So check the GCC version instead.
#
ifdef CONFIG_JUMP_LABEL
  ifneq ($(ACCUMULATE_OUTGOING_ARGS), 1)
	ACCUMULATE_OUTGOING_ARGS = $(call cc-if-fullversion, -lt, 040502, 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

# Stackpointer is addressed different for 32 bit and 64 bit x86
sp-$(CONFIG_X86_32) := esp
sp-$(CONFIG_X86_64) := rsp

# do binutils support CFI?
cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
# is .cfi_signal_frame supported too?
cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)

# does binutils support specific instructions?
asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
asinstr += $(call as-instr,pshufb %xmm0$(comma)%xmm0,-DCONFIG_AS_SSSE3=1)
asinstr += $(call as-instr,crc32l %eax$(comma)%eax,-DCONFIG_AS_CRC32=1)
avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
avx512_instr :=$(call as-instr,vpmovm2b %k1$(comma)%zmm5,-DCONFIG_AS_AVX512=1)
sha1_ni_instr :=$(call as-instr,sha1msg1 %xmm0$(comma)%xmm1,-DCONFIG_AS_SHA1_NI=1)
sha256_ni_instr :=$(call as-instr,sha256msg1 %xmm0$(comma)%xmm1,-DCONFIG_AS_SHA256_NI=1)

KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) $(avx512_instr) $(sha1_ni_instr) $(sha256_ni_instr)
KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) $(avx512_instr) $(sha1_ni_instr) $(sha256_ni_instr)

LDFLAGS := -m elf_$(UTS_MACHINE)

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

KBUILD_CFLAGS += $(mflags-y)
KBUILD_AFLAGS += $(mflags-y)

# Avoid indirect branches in kernel to deal with Spectre
ifdef CONFIG_RETPOLINE
    RETPOLINE_CFLAGS += $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register)
    ifneq ($(RETPOLINE_CFLAGS),)
        KBUILD_CFLAGS += $(RETPOLINE_CFLAGS) -DRETPOLINE
    endif
endif

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

###
# Syscall table generation

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

archprepare:
ifeq ($(CONFIG_KEXEC_FILE),y)
	$(Q)$(MAKE) $(build)=arch/x86/purgatory arch/x86/purgatory/kexec-purgatory.c
endif

###
# 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/

# must be linked after kernel/
drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/

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

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

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

define archhelp
  echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
  echo  '  install      - Install kernel using'
  echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
  echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
  echo  '                  install to $$(INSTALL_PATH) and run lilo'
  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'
endef
Commit	Line	Data
74b469f2 SR	1	# Unified Makefile for i386 and x86_64
74b469f2 SR	2
2266cfd5	3	# select defconfig based on actual architecture
d746d647	4	ifeq ($(ARCH),x86)
ffee0de4 DW	5	ifeq ($(shell uname -m),x86_64)
	6	KBUILD_DEFCONFIG := x86_64_defconfig
	7	else
d746d647	8	KBUILD_DEFCONFIG := i386_defconfig
ffee0de4	9	endif
d746d647 SR	10	else
	11	KBUILD_DEFCONFIG := $(ARCH)_defconfig
	12	endif
2266cfd5	13
d77698df MK	14	# For gcc stack alignment is specified with -mpreferred-stack-boundary,
	15	# clang has the option -mstack-alignment for that purpose.
	16	ifneq ($(call cc-option, -mpreferred-stack-boundary=4),)
	17	cc_stack_align_opt := -mpreferred-stack-boundary
	18	else ifneq ($(call cc-option, -mstack-alignment=4),)
	19	cc_stack_align_opt := -mstack-alignment
	20	endif
	21
1c678da3 DW	22	# How to compile the 16-bit code. Note we always compile for -march=i386;
1c678da3 DW	23	# that way we can complain to the user if the CPU is insufficient.
de3accda DW	24	#
de3accda DW	25	# The -m16 option is supported by GCC >= 4.9 and clang >= 3.5. For
a9cfccee PA	26	# older versions of GCC, include an assembly header to make sure that
	27	# gcc doesn't play any games behind our back.
	28	CODE16GCC_CFLAGS := -m32 -Wa,$(srctree)/arch/x86/boot/code16gcc.h
de3accda DW	29	M16_CFLAGS := $(call cc-option, -m16, $(CODE16GCC_CFLAGS))
	30
	31	REALMODE_CFLAGS := $(M16_CFLAGS) -g -Os -D__KERNEL__ \
	32	-DDISABLE_BRANCH_PROFILING \
1c678da3	33	-Wall -Wstrict-prototypes -march=i386 -mregparm=3 \
1c678da3	34	-fno-strict-aliasing -fomit-frame-pointer -fno-pic \
032a2c4f MK	35	-mno-mmx -mno-sse
	36
	37	REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -ffreestanding)
	38	REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -fno-stack-protector)
d77698df	39	REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), $(cc_stack_align_opt)=2)
1c678da3 DW	40	export REALMODE_CFLAGS
1c678da3 DW	41
0a6ef376 SR	42	# BITS is used as extension for files which are available in a 32 bit
	43	# and a 64 bit version to simplify shared Makefiles.
	44	# e.g.: obj-y += foo_$(BITS).o
	45	export BITS
74b469f2	46
a0215061 KC	47	ifdef CONFIG_X86_NEED_RELOCS
	48	LDFLAGS_vmlinux := --emit-relocs
	49	endif
	50
b2c51106 AL	51	#
	52	# Prevent GCC from generating any FP code by mistake.
	53	#
	54	# This must happen before we try the -mpreferred-stack-boundary, see:
	55	#
	56	# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383
	57	#
	58	KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow
	59	KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
	60
d746d647	61	ifeq ($(CONFIG_X86_32),y)
0a6ef376	62	BITS := 32
8c6531f7	63	UTS_MACHINE := i386
4ba7e5cd	64	CHECKFLAGS += -D__i386__
0a6ef376	65
4ba7e5cd SR	66	biarch := $(call cc-option,-m32)
	67	KBUILD_AFLAGS += $(biarch)
	68	KBUILD_CFLAGS += $(biarch)
0a6ef376	69
0a6ef376 SR	70	KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
0a6ef376 SR	71
484d90ee AB	72	# Never want PIC in a 32-bit kernel, prevent breakage with GCC built
	73	# with nonstandard options
	74	KBUILD_CFLAGS += -fno-pic
	75
d77698df MK	76	# Align the stack to the register width instead of using the default
	77	# alignment of 16 bytes. This reduces stack usage and the number of
	78	# alignment instructions.
	79	KBUILD_CFLAGS += $(call cc-option,$(cc_stack_align_opt)=2)
0a6ef376 SR	80
	81	# Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
	82	# a lot more stack due to the lack of sharing of stacklots:
c7bd0414 FP	83	KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \
c7bd0414 FP	84	$(call cc-option,-fno-unit-at-a-time))
0a6ef376 SR	85
0a6ef376 SR	86	# CPU-specific tuning. Anything which can be shared with UML should go here.
a436bb7b	87	include arch/x86/Makefile_32.cpu
0a6ef376 SR	88	KBUILD_CFLAGS += $(cflags-y)
	89
	90	# temporary until string.h is fixed
	91	KBUILD_CFLAGS += -ffreestanding
74b469f2	92	else
0a6ef376	93	BITS := 64
8c6531f7	94	UTS_MACHINE := x86_64
0a6ef376 SR	95	CHECKFLAGS += -D__x86_64__ -m64
0a6ef376 SR	96
14262d67	97	biarch := -m64
0a6ef376 SR	98	KBUILD_AFLAGS += -m64
	99	KBUILD_CFLAGS += -m64
	100
be6cb027	101	# Align jump targets to 1 byte, not the default 16 bytes:
2c4fd1ac	102	KBUILD_CFLAGS += $(call cc-option,-falign-jumps=1)
be6cb027	103
52648e83	104	# Pack loops tightly as well:
2c4fd1ac	105	KBUILD_CFLAGS += $(call cc-option,-falign-loops=1)
52648e83	106
5c630089	107	# Don't autogenerate traditional x87 instructions
8f2dd677 BW	108	KBUILD_CFLAGS += $(call cc-option,-mno-80387)
8f2dd677 BW	109	KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387)
5551a34e	110
d77698df MK	111	# By default gcc and clang use a stack alignment of 16 bytes for x86.
	112	# However the standard kernel entry on x86-64 leaves the stack on an
	113	# 8-byte boundary. If the compiler isn't informed about the actual
	114	# alignment it will generate extra alignment instructions for the
	115	# default alignment which keep the stack misaligned.
	116	# Furthermore an alignment to the register width reduces stack usage
	117	# and the number of alignment instructions.
	118	KBUILD_CFLAGS += $(call cc-option,$(cc_stack_align_opt)=3)
d9b0cde9	119
d9ee948d L	120	# Use -mskip-rax-setup if supported.
	121	KBUILD_CFLAGS += $(call cc-option,-mskip-rax-setup)
	122
0a6ef376 SR	123	# FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
	124	cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
	125	cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
	126
	127	cflags-$(CONFIG_MCORE2) += \
	128	$(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
366d19e1 TD	129	cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
366d19e1 TD	130	$(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
0a6ef376 SR	131	cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
	132	KBUILD_CFLAGS += $(cflags-y)
	133
	134	KBUILD_CFLAGS += -mno-red-zone
	135	KBUILD_CFLAGS += -mcmodel=kernel
	136
0a6ef376 SR	137	# -funit-at-a-time shrinks the kernel .text considerably
	138	# unfortunately it makes reading oopses harder.
	139	KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
5d707e9c	140	endif
0a6ef376	141
0bf62763 PA	142	ifdef CONFIG_X86_X32
	143	x32_ld_ok := $(call try-run,\
	144	/bin/echo -e '1: .quad 1b' \| \
b1e0d8b7	145	$(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \
0bf62763 PA	146	$(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
0bf62763 PA	147	$(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
8bd69c2d IM	148	ifeq ($(x32_ld_ok),y)
	149	CONFIG_X86_X32_ABI := y
	150	KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
	151	KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
	152	else
	153	$(warning CONFIG_X86_X32 enabled but no binutils support)
	154	endif
0bf62763 PA	155	endif
	156	export CONFIG_X86_X32_ABI
	157
dfec072e VN	158	# Don't unroll struct assignments with kmemcheck enabled
	159	ifeq ($(CONFIG_KMEMCHECK),y)
	160	KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
	161	endif
	162
3f135e57 JP	163	#
	164	# If the function graph tracer is used with mcount instead of fentry,
	165	# '-maccumulate-outgoing-args' is needed to prevent a GCC bug
	166	# (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42109)
	167	#
	168	ifdef CONFIG_FUNCTION_GRAPH_TRACER
	169	ifndef CONFIG_HAVE_FENTRY
	170	ACCUMULATE_OUTGOING_ARGS := 1
	171	else
	172	ifeq ($(call cc-option-yn, -mfentry), n)
	173	ACCUMULATE_OUTGOING_ARGS := 1
a5859c6d JP	174
	175	# GCC ignores '-maccumulate-outgoing-args' when used with '-Os'.
	176	# If '-Os' is enabled, disable it and print a warning.
	177	ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
	178	undefine CONFIG_CC_OPTIMIZE_FOR_SIZE
7e609120	179	$(warning Disabling CONFIG_CC_OPTIMIZE_FOR_SIZE. Your compiler does not have -mfentry so you cannot optimize for size with CONFIG_FUNCTION_GRAPH_TRACER.)
a5859c6d JP	180	endif
a5859c6d JP	181
3f135e57 JP	182	endif
	183	endif
	184	endif
	185
	186	#
	187	# Jump labels need '-maccumulate-outgoing-args' for gcc < 4.5.2 to prevent a
	188	# GCC bug (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46226). There's no way
	189	# to test for this bug at compile-time because the test case needs to execute,
	190	# which is a no-go for cross compilers. So check the GCC version instead.
	191	#
	192	ifdef CONFIG_JUMP_LABEL
	193	ifneq ($(ACCUMULATE_OUTGOING_ARGS), 1)
	194	ACCUMULATE_OUTGOING_ARGS = $(call cc-if-fullversion, -lt, 040502, 1)
	195	endif
	196	endif
	197
	198	ifeq ($(ACCUMULATE_OUTGOING_ARGS), 1)
4a1bec46 ND	199	# This compiler flag is not supported by Clang:
4a1bec46 ND	200	KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args,)
3f135e57 JP	201	endif
3f135e57 JP	202
0a6ef376 SR	203	# Stackpointer is addressed different for 32 bit and 64 bit x86
	204	sp-$(CONFIG_X86_32) := esp
	205	sp-$(CONFIG_X86_64) := rsp
	206
7b956f03 AL	207	# do binutils support CFI?
	208	cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
	209	# is .cfi_signal_frame supported too?
	210	cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
	211	cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
	212
d7acb92f PA	213	# does binutils support specific instructions?
d7acb92f PA	214	asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
75aaf4c3	215	asinstr += $(call as-instr,pshufb %xmm0$(comma)%xmm0,-DCONFIG_AS_SSSE3=1)
06325190	216	asinstr += $(call as-instr,crc32l %eax$(comma)%eax,-DCONFIG_AS_CRC32=1)
ea4d26ae	217	avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
7056741f	218	avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
e0a491c1	219	avx512_instr :=$(call as-instr,vpmovm2b %k1$(comma)%zmm5,-DCONFIG_AS_AVX512=1)
e38b6b7f	220	sha1_ni_instr :=$(call as-instr,sha1msg1 %xmm0$(comma)%xmm1,-DCONFIG_AS_SHA1_NI=1)
e38b6b7f	221	sha256_ni_instr :=$(call as-instr,sha256msg1 %xmm0$(comma)%xmm1,-DCONFIG_AS_SHA256_NI=1)
d7acb92f	222
e0a491c1 GK	223	KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) $(avx512_instr) $(sha1_ni_instr) $(sha256_ni_instr)
e0a491c1 GK	224	KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) $(avx512_instr) $(sha1_ni_instr) $(sha256_ni_instr)
0a6ef376 SR	225
0a6ef376 SR	226	LDFLAGS := -m elf_$(UTS_MACHINE)
25dfeeb7 SR	227
25dfeeb7 SR	228	# Speed up the build
0a6ef376	229	KBUILD_CFLAGS += -pipe
25dfeeb7 SR	230	# Workaround for a gcc prelease that unfortunately was shipped in a suse release
	231	KBUILD_CFLAGS += -Wno-sign-compare
	232	#
	233	KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
0a6ef376	234
0a6ef376 SR	235	KBUILD_CFLAGS += $(mflags-y)
	236	KBUILD_AFLAGS += $(mflags-y)
	237
ac0999a8 DW	238	# Avoid indirect branches in kernel to deal with Spectre
	239	ifdef CONFIG_RETPOLINE
	240	RETPOLINE_CFLAGS += $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register)
	241	ifneq ($(RETPOLINE_CFLAGS),)
	242	KBUILD_CFLAGS += $(RETPOLINE_CFLAGS) -DRETPOLINE
ac0999a8 DW	243	endif
	244	endif
	245
3ce9e53e	246	archscripts: scripts_basic
6520fe55 PA	247	$(Q)$(MAKE) $(build)=arch/x86/tools relocs
6520fe55 PA	248
303395ac PA	249	###
	250	# Syscall table generation
	251
	252	archheaders:
1f57d5d8	253	$(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all
303395ac	254
8fc5b4d4	255	archprepare:
74ca317c	256	ifeq ($(CONFIG_KEXEC_FILE),y)
8fc5b4d4	257	$(Q)$(MAKE) $(build)=arch/x86/purgatory arch/x86/purgatory/kexec-purgatory.c
8fc5b4d4 VG	258	endif
8fc5b4d4 VG	259
0a6ef376 SR	260	###
	261	# Kernel objects
	262
700efc1b EB	263	head-y := arch/x86/kernel/head_$(BITS).o
700efc1b EB	264	head-y += arch/x86/kernel/head$(BITS).o
f2d85299	265	head-y += arch/x86/kernel/ebda.o
8d152e7a	266	head-y += arch/x86/kernel/platform-quirks.o
0a6ef376 SR	267
	268	libs-y += arch/x86/lib/
	269
d1f0ae5e SR	270	# See arch/x86/Kbuild for content of core part of the kernel
d1f0ae5e SR	271	core-y += arch/x86/
0a6ef376 SR	272
	273	# drivers-y are linked after core-y
	274	drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
	275	drivers-$(CONFIG_PCI) += arch/x86/pci/
	276
	277	# must be linked after kernel/
	278	drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
	279
cf7700fe	280	# suspend and hibernation support
0a6ef376	281	drivers-$(CONFIG_PM) += arch/x86/power/
cf7700fe	282
0a6ef376	283	drivers-$(CONFIG_FB) += arch/x86/video/
0a6ef376 SR	284
	285	####
	286	# boot loader support. Several targets are kept for legacy purposes
	287
	288	boot := arch/x86/boot
	289
1648e4f8	290	BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
f9c5107c PA	291
f9c5107c PA	292	PHONY += bzImage $(BOOT_TARGETS)
0a6ef376 SR	293
	294	# Default kernel to build
	295	all: bzImage
	296
	297	# KBUILD_IMAGE specify target image being built
f9c5107c	298	KBUILD_IMAGE := $(boot)/bzImage
0a6ef376	299
f9c5107c	300	bzImage: vmlinux
ca0e9bad MH	301	ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
	302	$(Q)$(MAKE) $(build)=arch/x86/tools posttest
	303	endif
0a6ef376 SR	304	$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
0a6ef376 SR	305	$(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
41b3eae6	306	$(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
0a6ef376	307
f9c5107c PA	308	$(BOOT_TARGETS): vmlinux
f9c5107c PA	309	$(Q)$(MAKE) $(build)=$(boot) $@
0a6ef376	310
1648e4f8 PA	311	PHONY += install
	312	install:
	313	$(Q)$(MAKE) $(build)=$(boot) $@
	314
0a6ef376 SR	315	PHONY += vdso_install
0a6ef376 SR	316	vdso_install:
d603c8e1	317	$(Q)$(MAKE) $(build)=arch/x86/entry/vdso $@
0a6ef376 SR	318
	319	archclean:
	320	$(Q)rm -rf $(objtree)/arch/i386
	321	$(Q)rm -rf $(objtree)/arch/x86_64
	322	$(Q)$(MAKE) $(clean)=$(boot)
b2d668da	323	$(Q)$(MAKE) $(clean)=arch/x86/tools
b0108f9e	324	$(Q)$(MAKE) $(clean)=arch/x86/purgatory
0a6ef376 SR	325
0a6ef376 SR	326	define archhelp
37f30e21 AK	327	echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)'
37f30e21 AK	328	echo ' install - Install kernel using'
caa27b66 SR	329	echo ' (your) ~/bin/$(INSTALLKERNEL) or'
caa27b66 SR	330	echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
37f30e21 AK	331	echo ' install to $$(INSTALL_PATH) and run lilo'
	332	echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
	333	echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
	334	echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
	335	echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
	336	echo ' bzdisk/fdimage*/isoimage also accept:'
	337	echo ' FDARGS="..." arguments for the booted kernel'
	338	echo ' FDINITRD=file initrd for the booted kernel'
0a6ef376	339	endef