diff options
Diffstat (limited to 'arch/x86/Makefile')
| -rw-r--r-- | arch/x86/Makefile | 360 |
1 files changed, 360 insertions, 0 deletions
diff --git a/arch/x86/Makefile b/arch/x86/Makefile new file mode 100644 index 000000000..598f17810 --- /dev/null +++ b/arch/x86/Makefile @@ -0,0 +1,360 @@ +# 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 := -mindirect-branch=thunk-extern -mindirect-branch-register +RETPOLINE_VDSO_CFLAGS := -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_MITIGATION_RETHUNK +RETHUNK_CFLAGS := -mfunction-return=thunk-extern +RETHUNK_RUSTFLAGS := -Zfunction-return=thunk-extern +RETPOLINE_CFLAGS += $(RETHUNK_CFLAGS) +RETPOLINE_RUSTFLAGS += $(RETHUNK_RUSTFLAGS) +endif + +export RETHUNK_CFLAGS +export RETHUNK_RUSTFLAGS +export RETPOLINE_CFLAGS +export RETPOLINE_RUSTFLAGS +export RETPOLINE_VDSO_CFLAGS + +# For gcc stack alignment is specified with -mpreferred-stack-boundary, +# clang has the option -mstack-alignment for that purpose. +ifdef CONFIG_CC_IS_GCC + cc_stack_align4 := -mpreferred-stack-boundary=2 + cc_stack_align8 := -mpreferred-stack-boundary=3 +endif +ifdef CONFIG_CC_IS_CLANG + 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 := $(CC_FLAGS_DIALECT) -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 -mno-sse4a +KBUILD_RUSTFLAGS += --target=$(objtree)/scripts/target.json +KBUILD_RUSTFLAGS += -Ctarget-feature=-sse,-sse2,-sse3,-ssse3,-sse4.1,-sse4.2,-avx,-avx2 + +# The target.json file is not available when invoking rustc-option, so use the +# built-in target when checking whether flags are supported instead. +KBUILD_RUSTFLAGS_OPTION_CHKS += --target=x86_64-unknown-none + +# +# CFLAGS for compiling floating point code inside the kernel. +# +CC_FLAGS_FPU := -msse -msse2 +ifdef CONFIG_CC_IS_GCC +CC_FLAGS_FPU += -mhard-float +endif + +ifeq ($(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) +KBUILD_RUSTFLAGS += -Zcf-protection=branch $(if $(call rustc-min-version,109300),-Cjump-tables=n,-Zno-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) + + percpu_seg := fs +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 += -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 += $(cc_stack_align8) + + # Use -mskip-rax-setup if supported. + KBUILD_CFLAGS += -mskip-rax-setup + +ifdef CONFIG_X86_NATIVE_CPU + KBUILD_CFLAGS += -march=native + KBUILD_RUSTFLAGS += -Ctarget-cpu=native +else + KBUILD_CFLAGS += -march=x86-64 -mtune=generic + KBUILD_RUSTFLAGS += -Ctarget-cpu=x86-64 -Ztune-cpu=generic +endif + + KBUILD_CFLAGS += -mno-red-zone + KBUILD_CFLAGS += -mcmodel=kernel + KBUILD_RUSTFLAGS += -Cno-redzone=y + KBUILD_RUSTFLAGS += -Ccode-model=kernel + + percpu_seg := gs +endif + +ifeq ($(CONFIG_STACKPROTECTOR),y) + ifeq ($(CONFIG_SMP),y) + KBUILD_CFLAGS += -mstack-protector-guard-reg=$(percpu_seg) + KBUILD_CFLAGS += -mstack-protector-guard-symbol=__ref_stack_chk_guard + else + KBUILD_CFLAGS += -mstack-protector-guard=global + endif +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_MITIGATION_RETPOLINE + KBUILD_CFLAGS += $(RETPOLINE_CFLAGS) + KBUILD_RUSTFLAGS += $(RETPOLINE_RUSTFLAGS) + # Additionally, avoid generating expensive indirect jumps which + # are subject to retpolines for small number of switch cases. + # LLVM turns off jump table generation by default when under + # retpoline builds, however, gcc does not for x86. This has + # only been fixed starting from gcc stable version 8.4.0 and + # onwards, but not for older ones. See gcc bug #86952. + ifndef CONFIG_CC_IS_CLANG + KBUILD_CFLAGS += -fno-jump-tables + endif +endif + +ifdef CONFIG_MITIGATION_SLS + KBUILD_CFLAGS += -mharden-sls=all +endif + +ifdef CONFIG_CALL_PADDING +PADDING_CFLAGS := -fpatchable-function-entry=$(CONFIG_FUNCTION_PADDING_BYTES),$(CONFIG_FUNCTION_PADDING_BYTES) +KBUILD_CFLAGS += $(PADDING_CFLAGS) +export PADDING_CFLAGS + +PADDING_RUSTFLAGS := -Zpatchable-function-entry=$(CONFIG_FUNCTION_PADDING_BYTES),$(CONFIG_FUNCTION_PADDING_BYTES) +KBUILD_RUSTFLAGS += $(PADDING_RUSTFLAGS) +export PADDING_RUSTFLAGS +endif + +KBUILD_LDFLAGS += -m elf_$(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 +LDFLAGS_vmlinux += -z max-page-size=0x200000 +endif + + +archscripts: scripts_basic + $(Q)$(MAKE) $(build)=arch/x86/tools relocs vdso2c + +### +# Syscall table generation + +archheaders: + $(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all + +### +# <asm/cpufeaturemasks.h> header generation + +cpufeaturemasks.hdr := arch/x86/include/generated/asm/cpufeaturemasks.h +cpufeaturemasks.awk := $(srctree)/arch/x86/tools/cpufeaturemasks.awk +cpufeatures_hdr := $(srctree)/arch/x86/include/asm/cpufeatures.h +targets += $(cpufeaturemasks.hdr) + filechk_gen_featuremasks = $(AWK) -f $(cpufeaturemasks.awk) $(cpufeatures_hdr) $(KCONFIG_CONFIG) + +$(cpufeaturemasks.hdr): $(cpufeaturemasks.awk) $(cpufeatures_hdr) $(KCONFIG_CONFIG) FORCE + $(shell mkdir -p $(dir $@)) + $(call filechk,gen_featuremasks) +archprepare: $(cpufeaturemasks.hdr) + +### +# Kernel objects + +libs-y += arch/x86/lib/ + +# drivers-y are linked after core-y +drivers-$(CONFIG_PCI) += arch/x86/pci/ + +# suspend and hibernation support +drivers-$(CONFIG_PM) += arch/x86/power/ + +drivers-$(CONFIG_VIDEO) += 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: + $(call cmd,install) + +vdso-install-$(CONFIG_X86_64) += arch/x86/entry/vdso/vdso64/vdso64.so.dbg +vdso-install-$(CONFIG_X86_X32_ABI) += arch/x86/entry/vdso/vdso64/vdsox32.so.dbg +vdso-install-$(CONFIG_COMPAT_32) += arch/x86/entry/vdso/vdso32/vdso32.so.dbg + +archprepare: checkbin +checkbin: +ifdef CONFIG_MITIGATION_RETPOLINE +ifeq ($(RETPOLINE_CFLAGS),) + @echo "You are building kernel with non-retpoline compiler." >&2 + @echo "Please update your compiler." >&2 + @false +endif +endif + +ifdef CONFIG_UNWINDER_ORC +orc_hash_h := arch/$(SRCARCH)/include/generated/asm/orc_hash.h +orc_hash_sh := $(srctree)/scripts/orc_hash.sh +targets += $(orc_hash_h) +quiet_cmd_orc_hash = GEN $@ + cmd_orc_hash = mkdir -p $(dir $@); \ + $(CONFIG_SHELL) $(orc_hash_sh) < $< > $@ +$(orc_hash_h): $(srctree)/arch/x86/include/asm/orc_types.h $(orc_hash_sh) FORCE + $(call if_changed,orc_hash) +archprepare: $(orc_hash_h) +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' + +endef |