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_64BIT 29tool-archpref = $(64bit-tool-archpref) 30UTS_MACHINE := loongarch64 31endif 32 33ifneq ($(SUBARCH),$(ARCH)) 34 ifeq ($(CROSS_COMPILE),) 35 CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux- $(tool-archpref)-linux-gnu- $(tool-archpref)-unknown-linux-gnu-) 36 endif 37endif 38 39ifdef CONFIG_64BIT 40ld-emul = $(64bit-emul) 41cflags-y += -mabi=lp64s 42endif 43 44cflags-y += -G0 -pipe -msoft-float 45LDFLAGS_vmlinux += -G0 -static -n -nostdlib 46 47# When the assembler supports explicit relocation hint, we must use it. 48# GCC may have -mexplicit-relocs off by default if it was built with an old 49# assembler, so we force it via an option. 50# 51# When the assembler does not supports explicit relocation hint, we can't use 52# it. Disable it if the compiler supports it. 53# 54# If you've seen "unknown reloc hint" message building the kernel and you are 55# now wondering why "-mexplicit-relocs" is not wrapped with cc-option: the 56# combination of a "new" assembler and "old" compiler is not supported. Either 57# upgrade the compiler or downgrade the assembler. 58ifdef CONFIG_AS_HAS_EXPLICIT_RELOCS 59cflags-y += -mexplicit-relocs 60KBUILD_CFLAGS_KERNEL += -mdirect-extern-access 61else 62cflags-y += $(call cc-option,-mno-explicit-relocs) 63KBUILD_AFLAGS_KERNEL += -Wa,-mla-global-with-pcrel 64KBUILD_CFLAGS_KERNEL += -Wa,-mla-global-with-pcrel 65KBUILD_AFLAGS_MODULE += -Wa,-mla-global-with-abs 66KBUILD_CFLAGS_MODULE += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs 67endif 68 69cflags-y += -ffreestanding 70cflags-y += $(call cc-option, -mno-check-zero-division) 71 72ifndef CONFIG_PHYSICAL_START 73load-y = 0x9000000000200000 74else 75load-y = $(CONFIG_PHYSICAL_START) 76endif 77bootvars-y = VMLINUX_LOAD_ADDRESS=$(load-y) 78 79drivers-$(CONFIG_PCI) += arch/loongarch/pci/ 80 81KBUILD_AFLAGS += $(cflags-y) 82KBUILD_CFLAGS += $(cflags-y) 83KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y) 84 85# This is required to get dwarf unwinding tables into .debug_frame 86# instead of .eh_frame so we don't discard them. 87KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 88 89# Don't emit unaligned accesses. 90# Not all LoongArch cores support unaligned access, and as kernel we can't 91# rely on others to provide emulation for these accesses. 92KBUILD_CFLAGS += $(call cc-option,-mstrict-align) 93 94KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include) 95 96KBUILD_LDFLAGS += -m $(ld-emul) 97 98ifdef CONFIG_LOONGARCH 99CHECKFLAGS += $(shell $(CC) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \ 100 egrep -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \ 101 sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g') 102endif 103 104libs-y += arch/loongarch/lib/ 105libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 106 107ifeq ($(KBUILD_EXTMOD),) 108prepare: vdso_prepare 109vdso_prepare: prepare0 110 $(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h 111endif 112 113PHONY += vdso_install 114vdso_install: 115 $(Q)$(MAKE) $(build)=arch/loongarch/vdso $@ 116 117all: $(notdir $(KBUILD_IMAGE)) 118 119vmlinux.elf vmlinux.efi vmlinuz.efi: vmlinux 120 $(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $(boot)/$@ 121 122install: 123 $(Q)install -D -m 755 $(KBUILD_IMAGE) $(INSTALL_PATH)/$(image-name-y)-$(KERNELRELEASE) 124 $(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE) 125 $(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE) 126 127define archhelp 128 echo ' install - install kernel into $(INSTALL_PATH)' 129 echo 130endef 131