[linux-2.6-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),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.
#
# 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 -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), -Wno-address-of-packed-member)
REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), $(cc_stack_align4))
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 --discard-none
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_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
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" "$$TMPO" && \
			$(LD) -m elf32_x86_64 "$$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

#
# 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

# 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 += $(call as-instr,pshufb %xmm0$(comma)%xmm0,-DCONFIG_AS_SSSE3=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)

KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE)

#
# 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
KBUILD_LDFLAGS += $(call ld-option, -z max-page-size=0x200000)
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

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/

# 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 $@

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'
  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
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.
de3accda DW	27	#
de3accda DW	28	# The -m16 option is supported by GCC >= 4.9 and clang >= 3.5. For
a9cfccee PA	29	# older versions of GCC, include an assembly header to make sure that
	30	# gcc doesn't play any games behind our back.
	31	CODE16GCC_CFLAGS := -m32 -Wa,$(srctree)/arch/x86/boot/code16gcc.h
de3accda DW	32	M16_CFLAGS := $(call cc-option, -m16, $(CODE16GCC_CFLAGS))
de3accda DW	33
d6289f36	34	REALMODE_CFLAGS := $(M16_CFLAGS) -g -Os -DDISABLE_BRANCH_PROFILING \
1c678da3	35	-Wall -Wstrict-prototypes -march=i386 -mregparm=3 \
1c678da3	36	-fno-strict-aliasing -fomit-frame-pointer -fno-pic \
032a2c4f MK	37	-mno-mmx -mno-sse
	38
	39	REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -ffreestanding)
	40	REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -fno-stack-protector)
42e0e954	41	REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -Wno-address-of-packed-member)
9e8730b1	42	REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), $(cc_stack_align4))
1c678da3 DW	43	export REALMODE_CFLAGS
1c678da3 DW	44
0a6ef376 SR	45	# BITS is used as extension for files which are available in a 32 bit
	46	# and a 64 bit version to simplify shared Makefiles.
	47	# e.g.: obj-y += foo_$(BITS).o
	48	export BITS
74b469f2	49
a0215061	50	ifdef CONFIG_X86_NEED_RELOCS
7c21383f	51	LDFLAGS_vmlinux := --emit-relocs --discard-none
a0215061 KC	52	endif
a0215061 KC	53
b2c51106 AL	54	#
	55	# Prevent GCC from generating any FP code by mistake.
	56	#
	57	# This must happen before we try the -mpreferred-stack-boundary, see:
	58	#
	59	# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383
	60	#
	61	KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow
	62	KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
	63
d746d647	64	ifeq ($(CONFIG_X86_32),y)
0a6ef376	65	BITS := 32
8c6531f7	66	UTS_MACHINE := i386
4ba7e5cd	67	CHECKFLAGS += -D__i386__
0a6ef376	68
4ba7e5cd SR	69	biarch := $(call cc-option,-m32)
	70	KBUILD_AFLAGS += $(biarch)
	71	KBUILD_CFLAGS += $(biarch)
0a6ef376	72
0a6ef376 SR	73	KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
0a6ef376 SR	74
484d90ee AB	75	# Never want PIC in a 32-bit kernel, prevent breakage with GCC built
	76	# with nonstandard options
	77	KBUILD_CFLAGS += -fno-pic
	78
d77698df MK	79	# Align the stack to the register width instead of using the default
	80	# alignment of 16 bytes. This reduces stack usage and the number of
	81	# alignment instructions.
9e8730b1	82	KBUILD_CFLAGS += $(call cc-option,$(cc_stack_align4))
0a6ef376	83
0a6ef376	84	# CPU-specific tuning. Anything which can be shared with UML should go here.
a436bb7b	85	include arch/x86/Makefile_32.cpu
0a6ef376 SR	86	KBUILD_CFLAGS += $(cflags-y)
	87
	88	# temporary until string.h is fixed
	89	KBUILD_CFLAGS += -ffreestanding
74b469f2	90	else
0a6ef376	91	BITS := 64
8c6531f7	92	UTS_MACHINE := x86_64
1f2f01b1	93	CHECKFLAGS += -D__x86_64__
0a6ef376	94
14262d67	95	biarch := -m64
0a6ef376 SR	96	KBUILD_AFLAGS += -m64
	97	KBUILD_CFLAGS += -m64
	98
be6cb027	99	# Align jump targets to 1 byte, not the default 16 bytes:
2c4fd1ac	100	KBUILD_CFLAGS += $(call cc-option,-falign-jumps=1)
be6cb027	101
52648e83	102	# Pack loops tightly as well:
2c4fd1ac	103	KBUILD_CFLAGS += $(call cc-option,-falign-loops=1)
52648e83	104
5c630089	105	# Don't autogenerate traditional x87 instructions
8f2dd677 BW	106	KBUILD_CFLAGS += $(call cc-option,-mno-80387)
8f2dd677 BW	107	KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387)
5551a34e	108
d77698df MK	109	# By default gcc and clang use a stack alignment of 16 bytes for x86.
	110	# However the standard kernel entry on x86-64 leaves the stack on an
	111	# 8-byte boundary. If the compiler isn't informed about the actual
	112	# alignment it will generate extra alignment instructions for the
	113	# default alignment which keep the stack misaligned.
	114	# Furthermore an alignment to the register width reduces stack usage
	115	# and the number of alignment instructions.
9e8730b1	116	KBUILD_CFLAGS += $(call cc-option,$(cc_stack_align8))
d9b0cde9	117
d9ee948d L	118	# Use -mskip-rax-setup if supported.
	119	KBUILD_CFLAGS += $(call cc-option,-mskip-rax-setup)
	120
0a6ef376 SR	121	# FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
	122	cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
	123	cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
	124
	125	cflags-$(CONFIG_MCORE2) += \
	126	$(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
366d19e1 TD	127	cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
366d19e1 TD	128	$(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
0a6ef376 SR	129	cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
	130	KBUILD_CFLAGS += $(cflags-y)
	131
	132	KBUILD_CFLAGS += -mno-red-zone
	133	KBUILD_CFLAGS += -mcmodel=kernel
5d707e9c	134	endif
0a6ef376	135
0bf62763 PA	136	ifdef CONFIG_X86_X32
	137	x32_ld_ok := $(call try-run,\
	138	/bin/echo -e '1: .quad 1b' \| \
b1e0d8b7	139	$(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \
0bf62763 PA	140	$(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
0bf62763 PA	141	$(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
8bd69c2d IM	142	ifeq ($(x32_ld_ok),y)
	143	CONFIG_X86_X32_ABI := y
	144	KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
	145	KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
	146	else
	147	$(warning CONFIG_X86_X32 enabled but no binutils support)
	148	endif
0bf62763 PA	149	endif
	150	export CONFIG_X86_X32_ABI
	151
3f135e57 JP	152	#
	153	# If the function graph tracer is used with mcount instead of fentry,
	154	# '-maccumulate-outgoing-args' is needed to prevent a GCC bug
	155	# (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42109)
	156	#
	157	ifdef CONFIG_FUNCTION_GRAPH_TRACER
	158	ifndef CONFIG_HAVE_FENTRY
	159	ACCUMULATE_OUTGOING_ARGS := 1
	160	else
	161	ifeq ($(call cc-option-yn, -mfentry), n)
	162	ACCUMULATE_OUTGOING_ARGS := 1
a5859c6d JP	163
	164	# GCC ignores '-maccumulate-outgoing-args' when used with '-Os'.
	165	# If '-Os' is enabled, disable it and print a warning.
	166	ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
	167	undefine CONFIG_CC_OPTIMIZE_FOR_SIZE
7e609120	168	$(warning Disabling CONFIG_CC_OPTIMIZE_FOR_SIZE. Your compiler does not have -mfentry so you cannot optimize for size with CONFIG_FUNCTION_GRAPH_TRACER.)
a5859c6d JP	169	endif
a5859c6d JP	170
3f135e57 JP	171	endif
	172	endif
	173	endif
	174
3f135e57	175	ifeq ($(ACCUMULATE_OUTGOING_ARGS), 1)
4a1bec46 ND	176	# This compiler flag is not supported by Clang:
4a1bec46 ND	177	KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args,)
3f135e57 JP	178	endif
3f135e57 JP	179
0a6ef376 SR	180	# Stackpointer is addressed different for 32 bit and 64 bit x86
	181	sp-$(CONFIG_X86_32) := esp
	182	sp-$(CONFIG_X86_64) := rsp
	183
7b956f03 AL	184	# do binutils support CFI?
	185	cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
	186	# is .cfi_signal_frame supported too?
	187	cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
	188	cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
	189
d7acb92f	190	# does binutils support specific instructions?
75aaf4c3	191	asinstr += $(call as-instr,pshufb %xmm0$(comma)%xmm0,-DCONFIG_AS_SSSE3=1)
ea4d26ae	192	avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
7056741f	193	avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
e0a491c1	194	avx512_instr :=$(call as-instr,vpmovm2b %k1$(comma)%zmm5,-DCONFIG_AS_AVX512=1)
e38b6b7f	195	sha1_ni_instr :=$(call as-instr,sha1msg1 %xmm0$(comma)%xmm1,-DCONFIG_AS_SHA1_NI=1)
e38b6b7f	196	sha256_ni_instr :=$(call as-instr,sha256msg1 %xmm0$(comma)%xmm1,-DCONFIG_AS_SHA256_NI=1)
d7acb92f	197
e0a491c1 GK	198	KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) $(avx512_instr) $(sha1_ni_instr) $(sha256_ni_instr)
e0a491c1 GK	199	KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) $(avx512_instr) $(sha1_ni_instr) $(sha256_ni_instr)
0a6ef376	200
d503ac53	201	KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE)
25dfeeb7	202
e3d03598 L	203	#
	204	# The 64-bit kernel must be aligned to 2MB. Pass -z max-page-size=0x200000 to
	205	# the linker to force 2MB page size regardless of the default page size used
	206	# by the linker.
	207	#
	208	ifdef CONFIG_X86_64
d503ac53	209	KBUILD_LDFLAGS += $(call ld-option, -z max-page-size=0x200000)
e3d03598 L	210	endif
e3d03598 L	211
25dfeeb7 SR	212	# Workaround for a gcc prelease that unfortunately was shipped in a suse release
	213	KBUILD_CFLAGS += -Wno-sign-compare
	214	#
	215	KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
0a6ef376	216
76b04384 DW	217	# Avoid indirect branches in kernel to deal with Spectre
76b04384 DW	218	ifdef CONFIG_RETPOLINE
4cd24de3	219	KBUILD_CFLAGS += $(RETPOLINE_CFLAGS)
ce02ef06 DB	220	# Additionally, avoid generating expensive indirect jumps which
	221	# are subject to retpolines for small number of switch cases.
	222	# clang turns off jump table generation by default when under
a9d57ef1 DB	223	# retpoline builds, however, gcc does not for x86. This has
	224	# only been fixed starting from gcc stable version 8.4.0 and
	225	# onwards, but not for older ones. See gcc bug #86952.
	226	ifndef CONFIG_CC_IS_CLANG
	227	KBUILD_CFLAGS += $(call cc-option,-fno-jump-tables)
	228	endif
76b04384 DW	229	endif
76b04384 DW	230
3ce9e53e	231	archscripts: scripts_basic
6520fe55 PA	232	$(Q)$(MAKE) $(build)=arch/x86/tools relocs
6520fe55 PA	233
303395ac PA	234	###
	235	# Syscall table generation
	236
	237	archheaders:
1f57d5d8	238	$(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all
303395ac	239
0a6ef376 SR	240	###
	241	# Kernel objects
	242
700efc1b EB	243	head-y := arch/x86/kernel/head_$(BITS).o
700efc1b EB	244	head-y += arch/x86/kernel/head$(BITS).o
f2d85299	245	head-y += arch/x86/kernel/ebda.o
8d152e7a	246	head-y += arch/x86/kernel/platform-quirks.o
0a6ef376 SR	247
	248	libs-y += arch/x86/lib/
	249
d1f0ae5e SR	250	# See arch/x86/Kbuild for content of core part of the kernel
d1f0ae5e SR	251	core-y += arch/x86/
0a6ef376 SR	252
	253	# drivers-y are linked after core-y
	254	drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
	255	drivers-$(CONFIG_PCI) += arch/x86/pci/
	256
	257	# must be linked after kernel/
	258	drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
	259
cf7700fe	260	# suspend and hibernation support
0a6ef376	261	drivers-$(CONFIG_PM) += arch/x86/power/
cf7700fe	262
0a6ef376	263	drivers-$(CONFIG_FB) += arch/x86/video/
0a6ef376 SR	264
	265	####
	266	# boot loader support. Several targets are kept for legacy purposes
	267
	268	boot := arch/x86/boot
	269
1648e4f8	270	BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
f9c5107c PA	271
f9c5107c PA	272	PHONY += bzImage $(BOOT_TARGETS)
0a6ef376 SR	273
	274	# Default kernel to build
	275	all: bzImage
	276
	277	# KBUILD_IMAGE specify target image being built
f9c5107c	278	KBUILD_IMAGE := $(boot)/bzImage
0a6ef376	279
f9c5107c	280	bzImage: vmlinux
ca0e9bad MH	281	ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
	282	$(Q)$(MAKE) $(build)=arch/x86/tools posttest
	283	endif
0a6ef376 SR	284	$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
0a6ef376 SR	285	$(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
41b3eae6	286	$(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
0a6ef376	287
f9c5107c PA	288	$(BOOT_TARGETS): vmlinux
f9c5107c PA	289	$(Q)$(MAKE) $(build)=$(boot) $@
0a6ef376	290
1648e4f8 PA	291	PHONY += install
	292	install:
	293	$(Q)$(MAKE) $(build)=$(boot) $@
	294
0a6ef376 SR	295	PHONY += vdso_install
0a6ef376 SR	296	vdso_install:
d603c8e1	297	$(Q)$(MAKE) $(build)=arch/x86/entry/vdso $@
0a6ef376	298
829fe4aa BH	299	archprepare: checkbin
829fe4aa BH	300	checkbin:
e9666d10	301	ifndef CONFIG_CC_HAS_ASM_GOTO
829fe4aa BH	302	@echo Compiler lacks asm-goto support.
	303	@exit 1
	304	endif
25896d07 MY	305	ifdef CONFIG_RETPOLINE
	306	ifeq ($(RETPOLINE_CFLAGS),)
	307	@echo "You are building kernel with non-retpoline compiler." >&2
	308	@echo "Please update your compiler." >&2
	309	@false
	310	endif
	311	endif
829fe4aa	312
0a6ef376 SR	313	archclean:
	314	$(Q)rm -rf $(objtree)/arch/i386
	315	$(Q)rm -rf $(objtree)/arch/x86_64
	316	$(Q)$(MAKE) $(clean)=$(boot)
b2d668da	317	$(Q)$(MAKE) $(clean)=arch/x86/tools
0a6ef376 SR	318
0a6ef376 SR	319	define archhelp
37f30e21 AK	320	echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)'
37f30e21 AK	321	echo ' install - Install kernel using'
caa27b66 SR	322	echo ' (your) ~/bin/$(INSTALLKERNEL) or'
caa27b66 SR	323	echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
37f30e21 AK	324	echo ' install to $$(INSTALL_PATH) and run lilo'
	325	echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
	326	echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
	327	echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
	328	echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
	329	echo ' bzdisk/fdimage*/isoimage also accept:'
	330	echo ' FDARGS="..." arguments for the booted kernel'
	331	echo ' FDINITRD=file initrd for the booted kernel'
0a6ef376	332	endef