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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),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 $(call cc-option,-fcf-protection=none) 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)) 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 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,) # 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__ 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 misaligned. # 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

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