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317 lines
10 KiB
317 lines
10 KiB
# SPDX-License-Identifier: GPL-2.0 |
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# Unified Makefile for i386 and x86_64 |
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# select defconfig based on actual architecture |
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ifeq ($(ARCH),x86) |
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ifeq ($(shell uname -m),x86_64) |
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KBUILD_DEFCONFIG := x86_64_defconfig |
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else |
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KBUILD_DEFCONFIG := i386_defconfig |
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endif |
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else |
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KBUILD_DEFCONFIG := $(ARCH)_defconfig |
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endif |
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# For gcc stack alignment is specified with -mpreferred-stack-boundary, |
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# clang has the option -mstack-alignment for that purpose. |
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ifneq ($(call cc-option, -mpreferred-stack-boundary=4),) |
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cc_stack_align4 := -mpreferred-stack-boundary=2 |
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cc_stack_align8 := -mpreferred-stack-boundary=3 |
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else ifneq ($(call cc-option, -mstack-alignment=16),) |
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cc_stack_align4 := -mstack-alignment=4 |
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cc_stack_align8 := -mstack-alignment=8 |
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endif |
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# How to compile the 16-bit code. Note we always compile for -march=i386; |
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# that way we can complain to the user if the CPU is insufficient. |
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REALMODE_CFLAGS := -m16 -g -Os -DDISABLE_BRANCH_PROFILING \ |
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-Wall -Wstrict-prototypes -march=i386 -mregparm=3 \ |
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-fno-strict-aliasing -fomit-frame-pointer -fno-pic \ |
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-mno-mmx -mno-sse $(call cc-option,-fcf-protection=none) |
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REALMODE_CFLAGS += -ffreestanding |
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REALMODE_CFLAGS += -fno-stack-protector |
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REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -Wno-address-of-packed-member) |
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REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), $(cc_stack_align4)) |
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REALMODE_CFLAGS += $(CLANG_FLAGS) |
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export REALMODE_CFLAGS |
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# BITS is used as extension for files which are available in a 32 bit |
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# and a 64 bit version to simplify shared Makefiles. |
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# e.g.: obj-y += foo_$(BITS).o |
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export BITS |
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# |
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# Prevent GCC from generating any FP code by mistake. |
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# |
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# This must happen before we try the -mpreferred-stack-boundary, see: |
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# |
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# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383 |
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# |
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KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow |
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KBUILD_CFLAGS += $(call cc-option,-mno-avx,) |
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# Intel CET isn't enabled in the kernel |
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KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none) |
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ifeq ($(CONFIG_X86_32),y) |
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BITS := 32 |
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UTS_MACHINE := i386 |
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CHECKFLAGS += -D__i386__ |
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biarch := $(call cc-option,-m32) |
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KBUILD_AFLAGS += $(biarch) |
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KBUILD_CFLAGS += $(biarch) |
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KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return |
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# Never want PIC in a 32-bit kernel, prevent breakage with GCC built |
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# with nonstandard options |
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KBUILD_CFLAGS += -fno-pic |
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# Align the stack to the register width instead of using the default |
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# alignment of 16 bytes. This reduces stack usage and the number of |
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# alignment instructions. |
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KBUILD_CFLAGS += $(call cc-option,$(cc_stack_align4)) |
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# CPU-specific tuning. Anything which can be shared with UML should go here. |
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include arch/x86/Makefile_32.cpu |
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KBUILD_CFLAGS += $(cflags-y) |
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# temporary until string.h is fixed |
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KBUILD_CFLAGS += -ffreestanding |
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else |
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BITS := 64 |
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UTS_MACHINE := x86_64 |
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CHECKFLAGS += -D__x86_64__ |
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biarch := -m64 |
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KBUILD_AFLAGS += -m64 |
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KBUILD_CFLAGS += -m64 |
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# Align jump targets to 1 byte, not the default 16 bytes: |
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KBUILD_CFLAGS += $(call cc-option,-falign-jumps=1) |
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# Pack loops tightly as well: |
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KBUILD_CFLAGS += $(call cc-option,-falign-loops=1) |
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# Don't autogenerate traditional x87 instructions |
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KBUILD_CFLAGS += $(call cc-option,-mno-80387) |
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KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387) |
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# By default gcc and clang use a stack alignment of 16 bytes for x86. |
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# However the standard kernel entry on x86-64 leaves the stack on an |
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# 8-byte boundary. If the compiler isn't informed about the actual |
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# alignment it will generate extra alignment instructions for the |
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# default alignment which keep the stack *mis*aligned. |
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# Furthermore an alignment to the register width reduces stack usage |
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# and the number of alignment instructions. |
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KBUILD_CFLAGS += $(call cc-option,$(cc_stack_align8)) |
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# Use -mskip-rax-setup if supported. |
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KBUILD_CFLAGS += $(call cc-option,-mskip-rax-setup) |
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# FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu) |
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cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8) |
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cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona) |
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cflags-$(CONFIG_MCORE2) += \ |
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$(call cc-option,-march=core2,$(call cc-option,-mtune=generic)) |
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cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \ |
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$(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic)) |
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cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic) |
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KBUILD_CFLAGS += $(cflags-y) |
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KBUILD_CFLAGS += -mno-red-zone |
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KBUILD_CFLAGS += -mcmodel=kernel |
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endif |
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ifdef CONFIG_X86_X32 |
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x32_ld_ok := $(call try-run,\ |
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/bin/echo -e '1: .quad 1b' | \ |
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$(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \ |
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$(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \ |
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$(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n) |
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ifeq ($(x32_ld_ok),y) |
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CONFIG_X86_X32_ABI := y |
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KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI |
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KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI |
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else |
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$(warning CONFIG_X86_X32 enabled but no binutils support) |
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endif |
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endif |
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export CONFIG_X86_X32_ABI |
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# |
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# If the function graph tracer is used with mcount instead of fentry, |
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# '-maccumulate-outgoing-args' is needed to prevent a GCC bug |
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# (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42109) |
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# |
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ifdef CONFIG_FUNCTION_GRAPH_TRACER |
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ifndef CONFIG_HAVE_FENTRY |
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ACCUMULATE_OUTGOING_ARGS := 1 |
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else |
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ifeq ($(call cc-option-yn, -mfentry), n) |
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ACCUMULATE_OUTGOING_ARGS := 1 |
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# GCC ignores '-maccumulate-outgoing-args' when used with '-Os'. |
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# If '-Os' is enabled, disable it and print a warning. |
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ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE |
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undefine CONFIG_CC_OPTIMIZE_FOR_SIZE |
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$(warning Disabling CONFIG_CC_OPTIMIZE_FOR_SIZE. Your compiler does not have -mfentry so you cannot optimize for size with CONFIG_FUNCTION_GRAPH_TRACER.) |
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endif |
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endif |
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endif |
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endif |
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ifeq ($(ACCUMULATE_OUTGOING_ARGS), 1) |
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# This compiler flag is not supported by Clang: |
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KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args,) |
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endif |
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ifdef CONFIG_LTO_CLANG |
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KBUILD_LDFLAGS += -plugin-opt=-code-model=kernel \ |
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-plugin-opt=-stack-alignment=$(if $(CONFIG_X86_32),4,8) |
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endif |
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# Workaround for a gcc prelease that unfortunately was shipped in a suse release |
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KBUILD_CFLAGS += -Wno-sign-compare |
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# |
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KBUILD_CFLAGS += -fno-asynchronous-unwind-tables |
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# Avoid indirect branches in kernel to deal with Spectre |
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ifdef CONFIG_RETPOLINE |
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KBUILD_CFLAGS += $(RETPOLINE_CFLAGS) |
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# Additionally, avoid generating expensive indirect jumps which |
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# are subject to retpolines for small number of switch cases. |
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# clang turns off jump table generation by default when under |
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# retpoline builds, however, gcc does not for x86. This has |
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# only been fixed starting from gcc stable version 8.4.0 and |
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# onwards, but not for older ones. See gcc bug #86952. |
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ifndef CONFIG_CC_IS_CLANG |
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KBUILD_CFLAGS += $(call cc-option,-fno-jump-tables) |
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endif |
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endif |
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KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE) |
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ifdef CONFIG_X86_NEED_RELOCS |
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LDFLAGS_vmlinux := --emit-relocs --discard-none |
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else |
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LDFLAGS_vmlinux := |
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endif |
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# |
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# The 64-bit kernel must be aligned to 2MB. Pass -z max-page-size=0x200000 to |
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# the linker to force 2MB page size regardless of the default page size used |
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# by the linker. |
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# |
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ifdef CONFIG_X86_64 |
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LDFLAGS_vmlinux += -z max-page-size=0x200000 |
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endif |
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archscripts: scripts_basic |
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$(Q)$(MAKE) $(build)=arch/x86/tools relocs |
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### |
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# Syscall table generation |
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archheaders: |
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$(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all |
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### |
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# Kernel objects |
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head-y := arch/x86/kernel/head_$(BITS).o |
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head-y += arch/x86/kernel/head$(BITS).o |
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head-y += arch/x86/kernel/ebda.o |
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head-y += arch/x86/kernel/platform-quirks.o |
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libs-y += arch/x86/lib/ |
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# See arch/x86/Kbuild for content of core part of the kernel |
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core-y += arch/x86/ |
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# drivers-y are linked after core-y |
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drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/ |
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drivers-$(CONFIG_PCI) += arch/x86/pci/ |
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# suspend and hibernation support |
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drivers-$(CONFIG_PM) += arch/x86/power/ |
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drivers-$(CONFIG_FB) += arch/x86/video/ |
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#### |
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# boot loader support. Several targets are kept for legacy purposes |
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boot := arch/x86/boot |
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BOOT_TARGETS = bzdisk fdimage fdimage144 fdimage288 isoimage |
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PHONY += bzImage $(BOOT_TARGETS) |
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# Default kernel to build |
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all: bzImage |
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# KBUILD_IMAGE specify target image being built |
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KBUILD_IMAGE := $(boot)/bzImage |
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bzImage: vmlinux |
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ifeq ($(CONFIG_X86_DECODER_SELFTEST),y) |
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$(Q)$(MAKE) $(build)=arch/x86/tools posttest |
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endif |
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$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE) |
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$(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot |
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$(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@ |
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$(BOOT_TARGETS): vmlinux |
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$(Q)$(MAKE) $(build)=$(boot) $@ |
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PHONY += install bzlilo |
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install bzlilo: |
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$(Q)$(MAKE) $(build)=$(boot) $@ |
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PHONY += vdso_install |
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vdso_install: |
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$(Q)$(MAKE) $(build)=arch/x86/entry/vdso $@ |
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archprepare: checkbin |
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checkbin: |
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ifndef CONFIG_CC_HAS_ASM_GOTO |
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@echo Compiler lacks asm-goto support. |
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@exit 1 |
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endif |
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ifdef CONFIG_RETPOLINE |
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ifeq ($(RETPOLINE_CFLAGS),) |
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@echo "You are building kernel with non-retpoline compiler." >&2 |
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@echo "Please update your compiler." >&2 |
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@false |
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endif |
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endif |
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archclean: |
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$(Q)rm -rf $(objtree)/arch/i386 |
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$(Q)rm -rf $(objtree)/arch/x86_64 |
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$(Q)$(MAKE) $(clean)=$(boot) |
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$(Q)$(MAKE) $(clean)=arch/x86/tools |
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define archhelp |
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echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)' |
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echo ' install - Install kernel using (your) ~/bin/$(INSTALLKERNEL) or' |
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echo ' (distribution) /sbin/$(INSTALLKERNEL) or install to ' |
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echo ' $$(INSTALL_PATH) and run lilo' |
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echo '' |
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echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' |
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echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' |
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echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)' |
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echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)' |
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echo ' bzdisk/fdimage*/isoimage also accept:' |
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echo ' FDARGS="..." arguments for the booted kernel' |
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echo ' FDINITRD=file initrd for the booted kernel' |
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echo '' |
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echo ' kvm_guest.config - Enable Kconfig items for running this kernel as a KVM guest' |
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echo ' xen.config - Enable Kconfig items for running this kernel as a Xen guest' |
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endef
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