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_UNWINDER_ORC 30orc_hash_h := arch/$(SRCARCH)/include/generated/asm/orc_hash.h 31orc_hash_sh := $(srctree)/scripts/orc_hash.sh 32targets += $(orc_hash_h) 33quiet_cmd_orc_hash = GEN $@ 34 cmd_orc_hash = mkdir -p $(dir $@); \ 35 $(CONFIG_SHELL) $(orc_hash_sh) < $< > $@ 36$(orc_hash_h): $(srctree)/arch/loongarch/include/asm/orc_types.h $(orc_hash_sh) FORCE 37 $(call if_changed,orc_hash) 38archprepare: $(orc_hash_h) 39endif 40 41ifdef CONFIG_DYNAMIC_FTRACE 42KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 43CC_FLAGS_FTRACE := -fpatchable-function-entry=2 44endif 45 46ifdef CONFIG_64BIT 47tool-archpref = $(64bit-tool-archpref) 48UTS_MACHINE := loongarch64 49endif 50 51ifneq ($(SUBARCH),$(ARCH)) 52 ifeq ($(CROSS_COMPILE),) 53 CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux- $(tool-archpref)-linux-gnu- $(tool-archpref)-unknown-linux-gnu-) 54 endif 55endif 56 57ifdef CONFIG_64BIT 58ld-emul = $(64bit-emul) 59cflags-y += -mabi=lp64s 60endif 61 62cflags-y += -pipe -msoft-float 63LDFLAGS_vmlinux += -static -n -nostdlib 64 65# When the assembler supports explicit relocation hint, we must use it. 66# GCC may have -mexplicit-relocs off by default if it was built with an old 67# assembler, so we force it via an option. 68# 69# When the assembler does not supports explicit relocation hint, we can't use 70# it. Disable it if the compiler supports it. 71# 72# The combination of a "new" assembler and "old" GCC is not supported, given 73# the rarity of this combo and the extra complexity needed to make it work. 74# Either upgrade the compiler or downgrade the assembler; the build will error 75# out if it is the case (by probing for the model attribute; all supported 76# compilers in this case would have support). 77# 78# Also, -mdirect-extern-access is useful in case of building with explicit 79# relocs, for avoiding unnecessary GOT accesses. It is harmless to not have 80# support though. 81ifdef CONFIG_AS_HAS_EXPLICIT_RELOCS 82cflags-y += $(call cc-option,-mexplicit-relocs) 83KBUILD_CFLAGS_KERNEL += $(call cc-option,-mdirect-extern-access) 84KBUILD_CFLAGS_KERNEL += $(call cc-option,-fdirect-access-external-data) 85KBUILD_AFLAGS_MODULE += $(call cc-option,-fno-direct-access-external-data) 86KBUILD_CFLAGS_MODULE += $(call cc-option,-fno-direct-access-external-data) 87else 88cflags-y += $(call cc-option,-mno-explicit-relocs) 89KBUILD_AFLAGS_KERNEL += -Wa,-mla-global-with-pcrel 90KBUILD_CFLAGS_KERNEL += -Wa,-mla-global-with-pcrel 91KBUILD_AFLAGS_MODULE += -Wa,-mla-global-with-abs 92KBUILD_CFLAGS_MODULE += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs 93endif 94 95KBUILD_AFLAGS += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax) 96KBUILD_CFLAGS += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax) 97KBUILD_AFLAGS += $(call cc-option,-mthin-add-sub) $(call cc-option,-Wa$(comma)-mthin-add-sub) 98KBUILD_CFLAGS += $(call cc-option,-mthin-add-sub) $(call cc-option,-Wa$(comma)-mthin-add-sub) 99 100ifdef CONFIG_OBJTOOL 101KBUILD_CFLAGS += -fno-jump-tables 102endif 103 104KBUILD_RUSTFLAGS += --target=$(objtree)/scripts/target.json 105KBUILD_RUSTFLAGS_MODULE += -Crelocation-model=pic 106 107ifeq ($(CONFIG_RELOCATABLE),y) 108KBUILD_CFLAGS_KERNEL += -fPIE 109KBUILD_RUSTFLAGS_KERNEL += -Crelocation-model=pie 110LDFLAGS_vmlinux += -static -pie --no-dynamic-linker -z notext $(call ld-option, --apply-dynamic-relocs) 111endif 112 113cflags-y += $(call cc-option, -mno-check-zero-division) 114 115ifndef CONFIG_KASAN 116cflags-y += -fno-builtin-memcpy -fno-builtin-memmove -fno-builtin-memset 117endif 118 119load-y = 0x9000000000200000 120bootvars-y = VMLINUX_LOAD_ADDRESS=$(load-y) 121 122drivers-$(CONFIG_PCI) += arch/loongarch/pci/ 123 124KBUILD_AFLAGS += $(cflags-y) 125KBUILD_CFLAGS += $(cflags-y) 126KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y) 127 128# This is required to get dwarf unwinding tables into .debug_frame 129# instead of .eh_frame so we don't discard them. 130KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 131 132ifdef CONFIG_ARCH_STRICT_ALIGN 133# Don't emit unaligned accesses. 134# Not all LoongArch cores support unaligned access, and as kernel we can't 135# rely on others to provide emulation for these accesses. 136KBUILD_CFLAGS += $(call cc-option,-mstrict-align) 137else 138# Optimise for performance on hardware supports unaligned access. 139KBUILD_CFLAGS += $(call cc-option,-mno-strict-align) 140endif 141 142KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include) 143 144KBUILD_LDFLAGS += -m $(ld-emul) 145 146ifdef need-compiler 147CHECKFLAGS += $(shell $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \ 148 grep -E -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \ 149 sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g') 150endif 151 152libs-y += arch/loongarch/lib/ 153libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 154 155drivers-y += arch/loongarch/crypto/ 156 157# suspend and hibernation support 158drivers-$(CONFIG_PM) += arch/loongarch/power/ 159 160ifeq ($(KBUILD_EXTMOD),) 161prepare: vdso_prepare 162vdso_prepare: prepare0 163 $(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h 164endif 165 166vdso-install-y += arch/loongarch/vdso/vdso.so.dbg 167 168all: $(notdir $(KBUILD_IMAGE)) $(KBUILD_DTBS) 169 170vmlinuz.efi: vmlinux.efi 171 172vmlinux.elf vmlinux.efi vmlinuz.efi: vmlinux 173 $(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $(boot)/$@ 174 175install: 176 $(Q)install -D -m 755 $(KBUILD_IMAGE) $(INSTALL_PATH)/$(image-name-y)-$(KERNELRELEASE) 177 $(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE) 178 $(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE) 179 180define archhelp 181 echo ' install - install kernel into $(INSTALL_PATH)' 182 echo 183endef 184