FM / x86

/usr/src/linux-headers-5.15.0-190/arch/x86/

/usr/src/linux-headers-5.15.0-190/arch/x86

Name	Size	Mode	Actions
boot/	-	0755	rm
crypto/	-	0755	rm
entry/	-	0755	rm
events/	-	0755	rm
hyperv/	-	0755	rm
ia32/	-	0755	rm
include/	-	0755	rm
kernel/	-	0755	rm
kvm/	-	0755	rm
lib/	-	0755	rm
math-emu/	-	0755	rm
mm/	-	0755	rm
net/	-	0755	rm
pci/	-	0755	rm
platform/	-	0755	rm
power/	-	0755	rm
purgatory/	-	0755	rm
ras/	-	0755	rm
realmode/	-	0755	rm
tools/	-	0755	rm
um/	-	0755	rm
video/	-	0755	rm
xen/	-	0755	rm
Kbuild	476	0644	edit dl rm
Kconfig	100243	0644	edit dl rm
Kconfig.assembler	658	0644	edit dl rm
Kconfig.cpu	16622	0644	edit dl rm
Kconfig.debug	8994	0644	edit dl rm
Makefile	10085	0644	edit dl rm
Makefile.um	1154	0644	edit dl rm
Makefile_32.cpu	2474	0644	edit dl rm

Edit: /usr/src/linux-headers-5.15.0-190/arch/x86/Makefile (10085B)

# 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	:= -std=gnu89 -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

# 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__

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)

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
  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

KBUILD_LDFLAGS += -m elf_$(UTS_MACHINE)

ifdef CONFIG_LTO_CLANG
ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0)
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

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/

# 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:
	$(CONFIG_SHELL) $(srctree)/$(boot)/install.sh $(KERNELRELEASE) \
		$(KBUILD_IMAGE) System.map "$(INSTALL_PATH)"

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  '  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'

endef

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