mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-27 14:14:24 +08:00
3f1a9bc5d8
Commit c33621b4c5 ("x86/virt/tdx: Wire up basic SEAMCALL functions")
introduced a new instance of core-y instead of the standardized obj-y
syntax.
X86 Makefiles descend into subdirectories of arch/x86/virt inconsistently;
into arch/x86/virt/ via core-y defined in arch/x86/Makefile, but into
arch/x86/virt/svm/ via obj-y defined in arch/x86/Kbuild.
This is problematic when you build a single object in parallel because
multiple threads attempt to build the same file.
$ make -j$(nproc) arch/x86/virt/vmx/tdx/seamcall.o
[ snip ]
AS arch/x86/virt/vmx/tdx/seamcall.o
AS arch/x86/virt/vmx/tdx/seamcall.o
fixdep: error opening file: arch/x86/virt/vmx/tdx/.seamcall.o.d: No such file or directory
make[4]: *** [scripts/Makefile.build:362: arch/x86/virt/vmx/tdx/seamcall.o] Error 2
Use the obj-y syntax, as it works correctly.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20240330060554.18524-1-masahiroy@kernel.org
339 lines
11 KiB
Makefile
339 lines
11 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
|
|
# Unified Makefile for i386 and x86_64
|
|
|
|
# select defconfig based on actual architecture
|
|
ifeq ($(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
|
|
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 := -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=$(objtree)/scripts/target.json
|
|
KBUILD_RUSTFLAGS += -Ctarget-feature=-sse,-sse2,-sse3,-ssse3,-sse4.1,-sse4.2,-avx,-avx2
|
|
|
|
ifeq ($(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=__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 += $(RETPOLINE_CFLAGS)
|
|
# Additionally, avoid generating expensive indirect jumps which
|
|
# are subject to retpolines for small number of switch cases.
|
|
# clang turns off jump table generation by default when under
|
|
# retpoline builds, however, gcc does not for x86. This has
|
|
# only been fixed starting from gcc stable version 8.4.0 and
|
|
# onwards, but not for older ones. See gcc bug #86952.
|
|
ifndef CONFIG_CC_IS_CLANG
|
|
KBUILD_CFLAGS += -fno-jump-tables
|
|
endif
|
|
endif
|
|
|
|
ifdef CONFIG_MITIGATION_SLS
|
|
KBUILD_CFLAGS += -mharden-sls=all
|
|
endif
|
|
|
|
ifdef CONFIG_CALL_PADDING
|
|
PADDING_CFLAGS := -fpatchable-function-entry=$(CONFIG_FUNCTION_PADDING_BYTES),$(CONFIG_FUNCTION_PADDING_BYTES)
|
|
KBUILD_CFLAGS += $(PADDING_CFLAGS)
|
|
export PADDING_CFLAGS
|
|
endif
|
|
|
|
KBUILD_LDFLAGS += -m elf_$(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_FB_CORE) += 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
|