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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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3f89765d62
This feature depends on the kernel being relocatable. Enable using single kernel image for kdump, and then no longer need to build two kernels (production kernel and capture kernel share a single kernel image). Also enable CONFIG_CRASH_DUMP in loongson3_defconfig. Signed-off-by: Youling Tang <tangyouling@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
144 lines
4.3 KiB
Makefile
144 lines
4.3 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Author: Huacai Chen <chenhuacai@loongson.cn>
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# Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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boot := arch/loongarch/boot
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KBUILD_DEFCONFIG := loongson3_defconfig
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image-name-y := vmlinux
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image-name-$(CONFIG_EFI_ZBOOT) := vmlinuz
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ifndef CONFIG_EFI_STUB
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KBUILD_IMAGE := $(boot)/vmlinux.elf
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else
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KBUILD_IMAGE := $(boot)/$(image-name-y).efi
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endif
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#
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# Select the object file format to substitute into the linker script.
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#
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64bit-tool-archpref = loongarch64
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32bit-bfd = elf32-loongarch
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64bit-bfd = elf64-loongarch
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32bit-emul = elf32loongarch
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64bit-emul = elf64loongarch
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ifdef CONFIG_DYNAMIC_FTRACE
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KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
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CC_FLAGS_FTRACE := -fpatchable-function-entry=2
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endif
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ifdef CONFIG_64BIT
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tool-archpref = $(64bit-tool-archpref)
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UTS_MACHINE := loongarch64
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endif
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ifneq ($(SUBARCH),$(ARCH))
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ifeq ($(CROSS_COMPILE),)
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CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux- $(tool-archpref)-linux-gnu- $(tool-archpref)-unknown-linux-gnu-)
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endif
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endif
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ifdef CONFIG_64BIT
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ld-emul = $(64bit-emul)
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cflags-y += -mabi=lp64s
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endif
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cflags-y += -G0 -pipe -msoft-float
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LDFLAGS_vmlinux += -G0 -static -n -nostdlib
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# When the assembler supports explicit relocation hint, we must use it.
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# GCC may have -mexplicit-relocs off by default if it was built with an old
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# assembler, so we force it via an option.
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#
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# When the assembler does not supports explicit relocation hint, we can't use
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# it. Disable it if the compiler supports it.
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#
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# If you've seen "unknown reloc hint" message building the kernel and you are
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# now wondering why "-mexplicit-relocs" is not wrapped with cc-option: the
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# combination of a "new" assembler and "old" compiler is not supported. Either
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# upgrade the compiler or downgrade the assembler.
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ifdef CONFIG_AS_HAS_EXPLICIT_RELOCS
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cflags-y += -mexplicit-relocs
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KBUILD_CFLAGS_KERNEL += -mdirect-extern-access
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else
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cflags-y += $(call cc-option,-mno-explicit-relocs)
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KBUILD_AFLAGS_KERNEL += -Wa,-mla-global-with-pcrel
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KBUILD_CFLAGS_KERNEL += -Wa,-mla-global-with-pcrel
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KBUILD_AFLAGS_MODULE += -Wa,-mla-global-with-abs
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KBUILD_CFLAGS_MODULE += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs
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endif
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ifeq ($(CONFIG_RELOCATABLE),y)
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KBUILD_CFLAGS_KERNEL += -fPIE
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LDFLAGS_vmlinux += -static -pie --no-dynamic-linker -z notext
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endif
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cflags-y += -ffreestanding
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cflags-y += $(call cc-option, -mno-check-zero-division)
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load-y = 0x9000000000200000
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bootvars-y = VMLINUX_LOAD_ADDRESS=$(load-y)
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drivers-$(CONFIG_PCI) += arch/loongarch/pci/
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KBUILD_AFLAGS += $(cflags-y)
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KBUILD_CFLAGS += $(cflags-y)
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KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)
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# This is required to get dwarf unwinding tables into .debug_frame
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# instead of .eh_frame so we don't discard them.
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KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
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ifdef CONFIG_ARCH_STRICT_ALIGN
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# Don't emit unaligned accesses.
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# Not all LoongArch cores support unaligned access, and as kernel we can't
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# rely on others to provide emulation for these accesses.
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KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
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else
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# Optimise for performance on hardware supports unaligned access.
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KBUILD_CFLAGS += $(call cc-option,-mno-strict-align)
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endif
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KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include)
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KBUILD_LDFLAGS += -m $(ld-emul)
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ifdef CONFIG_LOONGARCH
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CHECKFLAGS += $(shell $(CC) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \
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grep -E -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \
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sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g')
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endif
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libs-y += arch/loongarch/lib/
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libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
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# suspend and hibernation support
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drivers-$(CONFIG_PM) += arch/loongarch/power/
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ifeq ($(KBUILD_EXTMOD),)
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prepare: vdso_prepare
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vdso_prepare: prepare0
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$(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h
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endif
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PHONY += vdso_install
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vdso_install:
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$(Q)$(MAKE) $(build)=arch/loongarch/vdso $@
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all: $(notdir $(KBUILD_IMAGE))
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vmlinux.elf vmlinux.efi vmlinuz.efi: vmlinux
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$(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $(boot)/$@
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install:
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$(Q)install -D -m 755 $(KBUILD_IMAGE) $(INSTALL_PATH)/$(image-name-y)-$(KERNELRELEASE)
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$(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE)
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$(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE)
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define archhelp
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echo ' install - install kernel into $(INSTALL_PATH)'
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echo
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endef
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