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# 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 := $(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_MITIGATION_RETHUNK RETHUNK_CFLAGS := -mfunction-return=thunk-extern RETHUNK_RUSTFLAGS := -Zfunction-return=thunk-extern RETPOLINE_CFLAGS += $(RETHUNK_CFLAGS) RETPOLINE_RUSTFLAGS += $(RETHUNK_RUSTFLAGS) endif export RETHUNK_CFLAGS export RETHUNK_RUSTFLAGS export RETPOLINE_CFLAGS export RETPOLINE_RUSTFLAGS export RETPOLINE_VDSO_CFLAGS # For gcc stack alignment is specified with -mpreferred-stack-boundary, # clang has the option -mstack-alignment for that purpose. ifneq ($(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=gnu11 -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 += $(CLANG_FLAGS) ifdef CONFIG_CC_IS_CLANG REALMODE_CFLAGS += -Wno-gnu endif export REALMODE_CFLAGS # BITS is used as extension for files which are available in a 32 bit # and a 64 bit version to simplify shared Makefiles. # e.g.: obj-y += foo_$(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 += --target=$(objtree)/scripts/target.json KBUILD_RUSTFLAGS += -Ctarget-feature=-sse,-sse2,-sse3,-ssse3,-sse4.1,-sse4.2,-avx,-avx2 # # CFLAGS for compiling floating point code inside the kernel. # CC_FLAGS_FPU := -msse -msse2 ifdef CONFIG_CC_IS_GCC # Stack alignment mismatch, proceed with caution. # GCC < 7.1 cannot compile code using `double` and -mpreferred-stack-boundary=3 # (8B stack alignment). # See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383 # # The "-msse" in the first argument is there so that the # -mpreferred-stack-boundary=3 build error: # # -mpreferred-stack-boundary=3 is not between 4 and 12 # # can be triggered. Otherwise gcc doesn't complain. CC_FLAGS_FPU += -mhard-float CC_FLAGS_FPU += $(call cc-option,-msse -mpreferred-stack-boundary=3,-mpreferred-stack-boundary=4) endif ifeq ($(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 -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 += $(cflags-y) # temporary until string.h is fixed KBUILD_CFLAGS += -ffreestanding ifeq ($(CONFIG_STACKPROTECTOR),y) ifeq ($(CONFIG_SMP),y) KBUILD_CFLAGS += -mstack-protector-guard-reg=fs \ -mstack-protector-guard-symbol=__ref_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_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) 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_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.so.dbg vdso-install-$(CONFIG_X86_X32_ABI) += arch/x86/entry/vdso/vdsox32.so.dbg vdso-install-$(CONFIG_COMPAT_32) += arch/x86/entry/vdso/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