1# SPDX-License-Identifier: GPL-2.0 2# 3# Author: Huacai Chen <chenhuacai@loongson.cn> 4# Copyright (C) 2020-2022 Loongson Technology Corporation Limited 5 6boot := arch/loongarch/boot 7 8KBUILD_DEFCONFIG := loongson3_defconfig 9 10KBUILD_IMAGE = $(boot)/vmlinux 11 12# 13# Select the object file format to substitute into the linker script. 14# 1564bit-tool-archpref = loongarch64 1632bit-bfd = elf32-loongarch 1764bit-bfd = elf64-loongarch 1832bit-emul = elf32loongarch 1964bit-emul = elf64loongarch 20 21ifdef CONFIG_64BIT 22tool-archpref = $(64bit-tool-archpref) 23UTS_MACHINE := loongarch64 24endif 25 26ifneq ($(SUBARCH),$(ARCH)) 27 ifeq ($(CROSS_COMPILE),) 28 CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux- $(tool-archpref)-linux-gnu- $(tool-archpref)-unknown-linux-gnu-) 29 endif 30endif 31 32ifdef CONFIG_64BIT 33ld-emul = $(64bit-emul) 34cflags-y += -mabi=lp64s 35endif 36 37cflags-y += -G0 -pipe -msoft-float 38LDFLAGS_vmlinux += -G0 -static -n -nostdlib 39KBUILD_AFLAGS_KERNEL += -Wa,-mla-global-with-pcrel 40KBUILD_CFLAGS_KERNEL += -Wa,-mla-global-with-pcrel 41KBUILD_AFLAGS_MODULE += -Wa,-mla-global-with-abs 42KBUILD_CFLAGS_MODULE += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs 43 44cflags-y += -ffreestanding 45cflags-y += $(call cc-option, -mno-check-zero-division) 46 47load-y = 0x9000000000200000 48bootvars-y = VMLINUX_LOAD_ADDRESS=$(load-y) 49 50KBUILD_AFLAGS += $(cflags-y) 51KBUILD_CFLAGS += $(cflags-y) 52KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y) 53 54# This is required to get dwarf unwinding tables into .debug_frame 55# instead of .eh_frame so we don't discard them. 56KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 57 58# Don't emit unaligned accesses. 59# Not all LoongArch cores support unaligned access, and as kernel we can't 60# rely on others to provide emulation for these accesses. 61KBUILD_CFLAGS += $(call cc-option,-mstrict-align) 62 63KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include) 64 65KBUILD_LDFLAGS += -m $(ld-emul) 66 67ifdef CONFIG_LOONGARCH 68CHECKFLAGS += $(shell $(CC) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \ 69 egrep -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \ 70 sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g') 71endif 72 73head-y := arch/loongarch/kernel/head.o 74 75libs-y += arch/loongarch/lib/ 76 77ifeq ($(KBUILD_EXTMOD),) 78prepare: vdso_prepare 79vdso_prepare: prepare0 80 $(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h 81endif 82 83PHONY += vdso_install 84vdso_install: 85 $(Q)$(MAKE) $(build)=arch/loongarch/vdso $@ 86 87all: $(KBUILD_IMAGE) 88 89$(KBUILD_IMAGE): vmlinux 90 $(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $@ 91 92install: 93 $(Q)install -D -m 755 $(KBUILD_IMAGE) $(INSTALL_PATH)/vmlinux-$(KERNELRELEASE) 94 $(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE) 95 $(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE) 96 97define archhelp 98 echo ' install - install kernel into $(INSTALL_PATH)' 99 echo 100endef 101