1 # SPDX-License-Identifier: GPL-2.0
3 # Author: Huacai Chen <chenhuacai@loongson.cn>
4 # Copyright (C) 2020-2022 Loongson Technology Corporation Limited
6 boot := arch/loongarch/boot
8 KBUILD_DEFCONFIG := loongson3_defconfig
10 KBUILD_IMAGE = $(boot)/vmlinux
13 # Select the object file format to substitute into the linker script.
15 64bit-tool-archpref = loongarch64
16 32bit-bfd = elf32-loongarch
17 64bit-bfd = elf64-loongarch
18 32bit-emul = elf32loongarch
19 64bit-emul = elf64loongarch
22 tool-archpref = $(64bit-tool-archpref)
23 UTS_MACHINE := loongarch64
26 ifneq ($(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-)
33 ld-emul = $(64bit-emul)
34 cflags-y += -mabi=lp64s
37 cflags-y += -G0 -pipe -msoft-float
38 LDFLAGS_vmlinux += -G0 -static -n -nostdlib
39 KBUILD_AFLAGS_KERNEL += -Wa,-mla-global-with-pcrel
40 KBUILD_CFLAGS_KERNEL += -Wa,-mla-global-with-pcrel
41 KBUILD_AFLAGS_MODULE += -Wa,-mla-global-with-abs
42 KBUILD_CFLAGS_MODULE += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs
44 cflags-y += -ffreestanding
45 cflags-y += $(call cc-option, -mno-check-zero-division)
47 load-y = 0x9000000000200000
48 bootvars-y = VMLINUX_LOAD_ADDRESS=$(load-y)
50 KBUILD_AFLAGS += $(cflags-y)
51 KBUILD_CFLAGS += $(cflags-y)
52 KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)
54 # This is required to get dwarf unwinding tables into .debug_frame
55 # instead of .eh_frame so we don't discard them.
56 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
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.
61 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
63 KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include)
65 KBUILD_LDFLAGS += -m $(ld-emul)
67 ifdef CONFIG_LOONGARCH
68 CHECKFLAGS += $(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')
73 head-y := arch/loongarch/kernel/head.o
75 libs-y += arch/loongarch/lib/
77 ifeq ($(KBUILD_EXTMOD),)
79 vdso_prepare: prepare0
80 $(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h
85 $(Q)$(MAKE) $(build)=arch/loongarch/vdso $@
89 $(KBUILD_IMAGE): vmlinux
90 $(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $@
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)
98 echo ' install - install kernel into $(INSTALL_PATH)'