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Huacai Chen fa96b57c14 LoongArch: Add build infrastructure

Add Kbuild, Makefile, Kconfig and link script for LoongArch build
infrastructure.

Reviewed-by: Guo Ren <guoren@kernel.org>
Reviewed-by: WANG Xuerui <git@xen0n.name>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

2022-06-03 20:09:27 +08:00

2.8 KiB

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SPDX-License-Identifier: GPL-2.0

Author: Huacai Chen chenhuacai@loongson.cn

Copyright (C) 2020-2022 Loongson Technology Corporation Limited

boot := arch/loongarch/boot

KBUILD_IMAGE = $(boot)/vmlinux

Select the object file format to substitute into the linker script.

64bit-tool-archpref = loongarch64 32bit-bfd = elf32-loongarch 64bit-bfd = elf64-loongarch 32bit-emul = elf32loongarch 64bit-emul = elf64loongarch

ifdef CONFIG_64BIT tool-archpref = $(64bit-tool-archpref) UTS_MACHINE := loongarch64 endif

ifneq ($(SUBARCH),$(ARCH)) ifeq ($(CROSS_COMPILE),) CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux- $(tool-archpref)-linux-gnu- $(tool-archpref)-unknown-linux-gnu-) endif endif

ifdef CONFIG_64BIT ld-emul = $(64bit-emul) cflags-y += -mabi=lp64s endif

cflags-y += -G0 -pipe -msoft-float LDFLAGS_vmlinux += -G0 -static -n -nostdlib KBUILD_AFLAGS_KERNEL += -Wa,-mla-global-with-pcrel KBUILD_CFLAGS_KERNEL += -Wa,-mla-global-with-pcrel KBUILD_AFLAGS_MODULE += -Wa,-mla-global-with-abs KBUILD_CFLAGS_MODULE += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs

cflags-y += -ffreestanding cflags-y += $(call cc-option, -mno-check-zero-division)

load-y = 0x9000000000200000 bootvars-y = VMLINUX_LOAD_ADDRESS=$(load-y)

KBUILD_AFLAGS += $(cflags-y) KBUILD_CFLAGS += $(cflags-y) KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)

This is required to get dwarf unwinding tables into .debug_frame

instead of .eh_frame so we don't discard them.

KBUILD_CFLAGS += -fno-asynchronous-unwind-tables

Don't emit unaligned accesses.

Not all LoongArch cores support unaligned access, and as kernel we can't

rely on others to provide emulation for these accesses.

KBUILD_CFLAGS += $(call cc-option,-mstrict-align)

KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include)

KBUILD_LDFLAGS += -m $(ld-emul)

ifdef CONFIG_LOONGARCH CHECKFLAGS += $(shell $(CC) $(KBUILD_CFLAGS) -dM -E -x c /dev/null |
egrep -vw 'GNUC(MINOR|PATCHLEVEL_)?_' |
sed -e "s/^#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/$$/&&/g') endif

head-y := arch/loongarch/kernel/head.o

libs-y += arch/loongarch/lib/

ifeq ($(KBUILD_EXTMOD),) prepare: vdso_prepare vdso_prepare: prepare0 $(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h endif

PHONY += vdso_install vdso_install: $(Q)$(MAKE) $(build)=arch/loongarch/vdso $@

all: $(KBUILD_IMAGE)

$(KBUILD_IMAGE): vmlinux $(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $@

install: $(Q)install -D -m 755 $(KBUILD_IMAGE) $(INSTALL_PATH)/vmlinux-$(KERNELRELEASE) $(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE) $(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE)

define archhelp echo ' install - install kernel into $(INSTALL_PATH)' echo endef

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