# 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_DEFCONFIG := loongson3_defconfig

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