diff options
Diffstat (limited to 'arch/x86/Makefile')
| -rw-r--r-- | arch/x86/Makefile | 325 |
1 files changed, 325 insertions, 0 deletions
diff --git a/arch/x86/Makefile b/arch/x86/Makefile new file mode 100644 index 000000000..3419ffa2a --- /dev/null +++ b/arch/x86/Makefile @@ -0,0 +1,325 @@ +# 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 + +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 += $(RETPOLINE_CFLAGS) + # Additionally, avoid generating expensive indirect jumps which + # are subject to retpolines for small number of switch cases. + # clang turns off jump table generation by default when under + # retpoline builds, however, gcc does not for x86. This has + # only been fixed starting from gcc stable version 8.4.0 and + # onwards, but not for older ones. See gcc bug #86952. + ifndef CONFIG_CC_IS_CLANG + KBUILD_CFLAGS += -fno-jump-tables + endif +endif + +ifdef CONFIG_SLS + KBUILD_CFLAGS += -mharden-sls=all +endif + +KBUILD_LDFLAGS += -m elf_$(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 + +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 |