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 9KBUILD_DTBS := dtbs 10 11image-name-y := vmlinux 12image-name-$(CONFIG_EFI_ZBOOT) := vmlinuz 13 14ifndef CONFIG_EFI_STUB 15KBUILD_IMAGE := $(boot)/vmlinux.elf 16else 17KBUILD_IMAGE := $(boot)/$(image-name-y).efi 18endif 19 20# 21# Select the object file format to substitute into the linker script. 22# 2364bit-tool-archpref = loongarch64 2432bit-bfd = elf32-loongarch 2564bit-bfd = elf64-loongarch 2632bit-emul = elf32loongarch 2764bit-emul = elf64loongarch 28 29ifdef CONFIG_DYNAMIC_FTRACE 30KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 31CC_FLAGS_FTRACE := -fpatchable-function-entry=2 32endif 33 34ifdef CONFIG_64BIT 35tool-archpref = $(64bit-tool-archpref) 36UTS_MACHINE := loongarch64 37endif 38 39ifneq ($(SUBARCH),$(ARCH)) 40 ifeq ($(CROSS_COMPILE),) 41 CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux- $(tool-archpref)-linux-gnu- $(tool-archpref)-unknown-linux-gnu-) 42 endif 43endif 44 45ifdef CONFIG_64BIT 46ld-emul = $(64bit-emul) 47cflags-y += -mabi=lp64s 48endif 49 50cflags-y += -pipe -msoft-float 51LDFLAGS_vmlinux += -static -n -nostdlib 52 53# When the assembler supports explicit relocation hint, we must use it. 54# GCC may have -mexplicit-relocs off by default if it was built with an old 55# assembler, so we force it via an option. 56# 57# When the assembler does not supports explicit relocation hint, we can't use 58# it. Disable it if the compiler supports it. 59# 60# The combination of a "new" assembler and "old" GCC is not supported, given 61# the rarity of this combo and the extra complexity needed to make it work. 62# Either upgrade the compiler or downgrade the assembler; the build will error 63# out if it is the case (by probing for the model attribute; all supported 64# compilers in this case would have support). 65# 66# Also, -mdirect-extern-access is useful in case of building with explicit 67# relocs, for avoiding unnecessary GOT accesses. It is harmless to not have 68# support though. 69ifdef CONFIG_AS_HAS_EXPLICIT_RELOCS 70cflags-y += $(call cc-option,-mexplicit-relocs) 71KBUILD_CFLAGS_KERNEL += $(call cc-option,-mdirect-extern-access) 72KBUILD_CFLAGS_KERNEL += $(call cc-option,-fdirect-access-external-data) 73KBUILD_AFLAGS_MODULE += $(call cc-option,-fno-direct-access-external-data) 74KBUILD_CFLAGS_MODULE += $(call cc-option,-fno-direct-access-external-data) 75KBUILD_AFLAGS_MODULE += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax) 76KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax) 77else 78cflags-y += $(call cc-option,-mno-explicit-relocs) 79KBUILD_AFLAGS_KERNEL += -Wa,-mla-global-with-pcrel 80KBUILD_CFLAGS_KERNEL += -Wa,-mla-global-with-pcrel 81KBUILD_AFLAGS_MODULE += -Wa,-mla-global-with-abs 82KBUILD_CFLAGS_MODULE += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs 83endif 84 85KBUILD_RUSTFLAGS += --target=$(objtree)/scripts/target.json 86KBUILD_RUSTFLAGS_MODULE += -Crelocation-model=pic 87 88ifeq ($(CONFIG_RELOCATABLE),y) 89KBUILD_CFLAGS_KERNEL += -fPIE 90KBUILD_RUSTFLAGS_KERNEL += -Crelocation-model=pie 91LDFLAGS_vmlinux += -static -pie --no-dynamic-linker -z notext $(call ld-option, --apply-dynamic-relocs) 92endif 93 94cflags-y += $(call cc-option, -mno-check-zero-division) 95 96ifndef CONFIG_KASAN 97cflags-y += -fno-builtin-memcpy -fno-builtin-memmove -fno-builtin-memset 98endif 99 100load-y = 0x9000000000200000 101bootvars-y = VMLINUX_LOAD_ADDRESS=$(load-y) 102 103drivers-$(CONFIG_PCI) += arch/loongarch/pci/ 104 105KBUILD_AFLAGS += $(cflags-y) 106KBUILD_CFLAGS += $(cflags-y) 107KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y) 108 109# This is required to get dwarf unwinding tables into .debug_frame 110# instead of .eh_frame so we don't discard them. 111KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 112 113ifdef CONFIG_ARCH_STRICT_ALIGN 114# Don't emit unaligned accesses. 115# Not all LoongArch cores support unaligned access, and as kernel we can't 116# rely on others to provide emulation for these accesses. 117KBUILD_CFLAGS += $(call cc-option,-mstrict-align) 118else 119# Optimise for performance on hardware supports unaligned access. 120KBUILD_CFLAGS += $(call cc-option,-mno-strict-align) 121endif 122 123KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include) 124 125KBUILD_LDFLAGS += -m $(ld-emul) 126 127ifdef need-compiler 128CHECKFLAGS += $(shell $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \ 129 grep -E -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \ 130 sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g') 131endif 132 133libs-y += arch/loongarch/lib/ 134libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 135 136drivers-y += arch/loongarch/crypto/ 137 138# suspend and hibernation support 139drivers-$(CONFIG_PM) += arch/loongarch/power/ 140 141ifeq ($(KBUILD_EXTMOD),) 142prepare: vdso_prepare 143vdso_prepare: prepare0 144 $(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h 145endif 146 147vdso-install-y += arch/loongarch/vdso/vdso.so.dbg 148 149all: $(notdir $(KBUILD_IMAGE)) $(KBUILD_DTBS) 150 151vmlinuz.efi: vmlinux.efi 152 153vmlinux.elf vmlinux.efi vmlinuz.efi: vmlinux 154 $(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $(boot)/$@ 155 156install: 157 $(Q)install -D -m 755 $(KBUILD_IMAGE) $(INSTALL_PATH)/$(image-name-y)-$(KERNELRELEASE) 158 $(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE) 159 $(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE) 160 161define archhelp 162 echo ' install - install kernel into $(INSTALL_PATH)' 163 echo 164endef 165