diff options
Diffstat (limited to '')
| -rw-r--r-- | arch/x86/Makefile | 344 | ||||
| -rw-r--r-- | arch/x86/Makefile.um | 59 | ||||
| -rw-r--r-- | arch/x86/Makefile_32.cpu | 52 |
3 files changed, 455 insertions, 0 deletions
diff --git a/arch/x86/Makefile b/arch/x86/Makefile new file mode 100644 index 000000000..65a8722e7 --- /dev/null +++ b/arch/x86/Makefile @@ -0,0 +1,344 @@ +# 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 *mis*aligned. + # 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 + + # -funit-at-a-time shrinks the kernel .text considerably + # unfortunately it makes reading oopses harder. + KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time) +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,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1) +asinstr += $(call as-instr,pshufb %xmm0$(comma)%xmm0,-DCONFIG_AS_SSSE3=1) +asinstr += $(call as-instr,crc32l %eax$(comma)%eax,-DCONFIG_AS_CRC32=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 + +# Speed up the build +KBUILD_CFLAGS += -pipe +# 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 diff --git a/arch/x86/Makefile.um b/arch/x86/Makefile.um new file mode 100644 index 000000000..91085a08d --- /dev/null +++ b/arch/x86/Makefile.um @@ -0,0 +1,59 @@ +# SPDX-License-Identifier: GPL-2.0 +core-y += arch/x86/crypto/ + +ifeq ($(CONFIG_X86_32),y) +START := 0x8048000 + +KBUILD_LDFLAGS += -m elf_i386 +ELF_ARCH := i386 +ELF_FORMAT := elf32-i386 +CHECKFLAGS += -D__i386__ + +KBUILD_CFLAGS += $(call cc-option,-m32) +KBUILD_AFLAGS += $(call cc-option,-m32) +LINK-y += $(call cc-option,-m32) + +LDS_EXTRA := -Ui386 +export LDS_EXTRA + +# First of all, tune CFLAGS for the specific CPU. This actually sets cflags-y. +include arch/x86/Makefile_32.cpu + +# prevent gcc from keeping the stack 16 byte aligned. Taken from i386. +cflags-y += $(call cc-option,-mpreferred-stack-boundary=2) + +# Prevent sprintf in nfsd from being converted to strcpy and resulting in +# an unresolved reference. +cflags-y += -ffreestanding + +# Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use +# a lot more stack due to the lack of sharing of stacklots. Also, gcc +# 4.3.0 needs -funit-at-a-time for extern inline functions. +KBUILD_CFLAGS += $(shell if [ $(cc-version) -lt 0400 ] ; then \ + echo $(call cc-option,-fno-unit-at-a-time); \ + else echo $(call cc-option,-funit-at-a-time); fi ;) + +KBUILD_CFLAGS += $(cflags-y) + +else + +START := 0x60000000 + +KBUILD_CFLAGS += -fno-builtin -m64 + +CHECKFLAGS += -m64 -D__x86_64__ +KBUILD_AFLAGS += -m64 +KBUILD_LDFLAGS += -m elf_x86_64 +KBUILD_CPPFLAGS += -m64 + +ELF_ARCH := i386:x86-64 +ELF_FORMAT := elf64-x86-64 + +# Not on all 64-bit distros /lib is a symlink to /lib64. PLD is an example. + +LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib64 +LINK-y += -m64 + +# Do unit-at-a-time unconditionally on x86_64, following the host +KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time) +endif diff --git a/arch/x86/Makefile_32.cpu b/arch/x86/Makefile_32.cpu new file mode 100644 index 000000000..1f5faf860 --- /dev/null +++ b/arch/x86/Makefile_32.cpu @@ -0,0 +1,52 @@ +# SPDX-License-Identifier: GPL-2.0 +# CPU tuning section - shared with UML. +# Must change only cflags-y (or [yn]), not CFLAGS! That makes a difference for UML. + +#-mtune exists since gcc 3.4 +HAS_MTUNE := $(call cc-option-yn, -mtune=i386) +ifeq ($(HAS_MTUNE),y) +tune = $(call cc-option,-mtune=$(1),$(2)) +else +tune = $(call cc-option,-mcpu=$(1),$(2)) +endif + +cflags-$(CONFIG_M486) += -march=i486 +cflags-$(CONFIG_M586) += -march=i586 +cflags-$(CONFIG_M586TSC) += -march=i586 +cflags-$(CONFIG_M586MMX) += -march=pentium-mmx +cflags-$(CONFIG_M686) += -march=i686 +cflags-$(CONFIG_MPENTIUMII) += -march=i686 $(call tune,pentium2) +cflags-$(CONFIG_MPENTIUMIII) += -march=i686 $(call tune,pentium3) +cflags-$(CONFIG_MPENTIUMM) += -march=i686 $(call tune,pentium3) +cflags-$(CONFIG_MPENTIUM4) += -march=i686 $(call tune,pentium4) +cflags-$(CONFIG_MK6) += -march=k6 +# Please note, that patches that add -march=athlon-xp and friends are pointless. +# They make zero difference whatsosever to performance at this time. +cflags-$(CONFIG_MK7) += -march=athlon +cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8,-march=athlon) +cflags-$(CONFIG_MCRUSOE) += -march=i686 -falign-functions=0 -falign-jumps=0 -falign-loops=0 +cflags-$(CONFIG_MEFFICEON) += -march=i686 $(call tune,pentium3) -falign-functions=0 -falign-jumps=0 -falign-loops=0 +cflags-$(CONFIG_MWINCHIPC6) += $(call cc-option,-march=winchip-c6,-march=i586) +cflags-$(CONFIG_MWINCHIP3D) += $(call cc-option,-march=winchip2,-march=i586) +cflags-$(CONFIG_MCYRIXIII) += $(call cc-option,-march=c3,-march=i486) -falign-functions=0 -falign-jumps=0 -falign-loops=0 +cflags-$(CONFIG_MVIAC3_2) += $(call cc-option,-march=c3-2,-march=i686) +cflags-$(CONFIG_MVIAC7) += -march=i686 +cflags-$(CONFIG_MCORE2) += -march=i686 $(call tune,core2) +cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom,$(call cc-option,-march=core2,-march=i686)) \ + $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic)) + +# AMD Elan support +cflags-$(CONFIG_MELAN) += -march=i486 + +# Geode GX1 support +cflags-$(CONFIG_MGEODEGX1) += -march=pentium-mmx +cflags-$(CONFIG_MGEODE_LX) += $(call cc-option,-march=geode,-march=pentium-mmx) +# add at the end to overwrite eventual tuning options from earlier +# cpu entries +cflags-$(CONFIG_X86_GENERIC) += $(call tune,generic,$(call tune,i686)) + +# Bug fix for binutils: this option is required in order to keep +# binutils from generating NOPL instructions against our will. +ifneq ($(CONFIG_X86_P6_NOP),y) +cflags-y += $(call cc-option,-Wa$(comma)-mtune=generic32,) +endif |