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 10image-name-y := vmlinux 11image-name-$(CONFIG_EFI_ZBOOT) := vmlinuz 12 13ifndef CONFIG_EFI_STUB 14KBUILD_IMAGE := $(boot)/vmlinux.elf 15else 16KBUILD_IMAGE := $(boot)/$(image-name-y).efi 17endif 18 19# 20# Select the object file format to substitute into the linker script. 21# 2264bit-tool-archpref = loongarch64 2332bit-bfd = elf32-loongarch 2464bit-bfd = elf64-loongarch 2532bit-emul = elf32loongarch 2664bit-emul = elf64loongarch 27 28ifdef CONFIG_DYNAMIC_FTRACE 29KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 30CC_FLAGS_FTRACE := -fpatchable-function-entry=2 31endif 32 33ifdef CONFIG_64BIT 34tool-archpref = $(64bit-tool-archpref) 35UTS_MACHINE := loongarch64 36endif 37 38ifneq ($(SUBARCH),$(ARCH)) 39 ifeq ($(CROSS_COMPILE),) 40 CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux- $(tool-archpref)-linux-gnu- $(tool-archpref)-unknown-linux-gnu-) 41 endif 42endif 43 44ifdef CONFIG_64BIT 45ld-emul = $(64bit-emul) 46cflags-y += -mabi=lp64s 47endif 48 49cflags-y += -pipe -msoft-float 50LDFLAGS_vmlinux += -static -n -nostdlib 51 52# When the assembler supports explicit relocation hint, we must use it. 53# GCC may have -mexplicit-relocs off by default if it was built with an old 54# assembler, so we force it via an option. 55# 56# When the assembler does not supports explicit relocation hint, we can't use 57# it. Disable it if the compiler supports it. 58# 59# The combination of a "new" assembler and "old" GCC is not supported, given 60# the rarity of this combo and the extra complexity needed to make it work. 61# Either upgrade the compiler or downgrade the assembler; the build will error 62# out if it is the case (by probing for the model attribute; all supported 63# compilers in this case would have support). 64# 65# Also, -mdirect-extern-access is useful in case of building with explicit 66# relocs, for avoiding unnecessary GOT accesses. It is harmless to not have 67# support though. 68ifdef CONFIG_AS_HAS_EXPLICIT_RELOCS 69cflags-y += $(call cc-option,-mexplicit-relocs) 70KBUILD_CFLAGS_KERNEL += $(call cc-option,-mdirect-extern-access) 71KBUILD_AFLAGS_MODULE += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax) 72KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax) 73else 74cflags-y += $(call cc-option,-mno-explicit-relocs) 75KBUILD_AFLAGS_KERNEL += -Wa,-mla-global-with-pcrel 76KBUILD_CFLAGS_KERNEL += -Wa,-mla-global-with-pcrel 77KBUILD_AFLAGS_MODULE += -Wa,-mla-global-with-abs 78KBUILD_CFLAGS_MODULE += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs 79endif 80 81ifeq ($(CONFIG_RELOCATABLE),y) 82KBUILD_CFLAGS_KERNEL += -fPIE 83LDFLAGS_vmlinux += -static -pie --no-dynamic-linker -z notext 84endif 85 86cflags-y += -ffreestanding 87cflags-y += $(call cc-option, -mno-check-zero-division) 88 89load-y = 0x9000000000200000 90bootvars-y = VMLINUX_LOAD_ADDRESS=$(load-y) 91 92drivers-$(CONFIG_PCI) += arch/loongarch/pci/ 93 94KBUILD_AFLAGS += $(cflags-y) 95KBUILD_CFLAGS += $(cflags-y) 96KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y) 97 98# This is required to get dwarf unwinding tables into .debug_frame 99# instead of .eh_frame so we don't discard them. 100KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 101 102ifdef CONFIG_ARCH_STRICT_ALIGN 103# Don't emit unaligned accesses. 104# Not all LoongArch cores support unaligned access, and as kernel we can't 105# rely on others to provide emulation for these accesses. 106KBUILD_CFLAGS += $(call cc-option,-mstrict-align) 107else 108# Optimise for performance on hardware supports unaligned access. 109KBUILD_CFLAGS += $(call cc-option,-mno-strict-align) 110endif 111 112KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include) 113 114KBUILD_LDFLAGS += -m $(ld-emul) 115 116ifdef need-compiler 117CHECKFLAGS += $(shell $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \ 118 grep -E -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \ 119 sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g') 120endif 121 122libs-y += arch/loongarch/lib/ 123libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 124 125drivers-y += arch/loongarch/crypto/ 126 127# suspend and hibernation support 128drivers-$(CONFIG_PM) += arch/loongarch/power/ 129 130ifeq ($(KBUILD_EXTMOD),) 131prepare: vdso_prepare 132vdso_prepare: prepare0 133 $(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h 134endif 135 136PHONY += vdso_install 137vdso_install: 138 $(Q)$(MAKE) $(build)=arch/loongarch/vdso $@ 139 140all: $(notdir $(KBUILD_IMAGE)) 141 142vmlinux.elf vmlinux.efi vmlinuz.efi: vmlinux 143 $(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $(boot)/$@ 144 145install: 146 $(Q)install -D -m 755 $(KBUILD_IMAGE) $(INSTALL_PATH)/$(image-name-y)-$(KERNELRELEASE) 147 $(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE) 148 $(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE) 149 150define archhelp 151 echo ' install - install kernel into $(INSTALL_PATH)' 152 echo 153endef 154