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 += -G0 -pipe -msoft-float 50LDFLAGS_vmlinux += -G0 -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# If you've seen "unknown reloc hint" message building the kernel and you are 60# now wondering why "-mexplicit-relocs" is not wrapped with cc-option: the 61# combination of a "new" assembler and "old" compiler is not supported. Either 62# upgrade the compiler or downgrade the assembler. 63ifdef CONFIG_AS_HAS_EXPLICIT_RELOCS 64cflags-y += -mexplicit-relocs 65KBUILD_CFLAGS_KERNEL += -mdirect-extern-access 66else 67cflags-y += $(call cc-option,-mno-explicit-relocs) 68KBUILD_AFLAGS_KERNEL += -Wa,-mla-global-with-pcrel 69KBUILD_CFLAGS_KERNEL += -Wa,-mla-global-with-pcrel 70KBUILD_AFLAGS_MODULE += -Wa,-mla-global-with-abs 71KBUILD_CFLAGS_MODULE += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs 72endif 73 74ifeq ($(CONFIG_RELOCATABLE),y) 75KBUILD_CFLAGS_KERNEL += -fPIE 76LDFLAGS_vmlinux += -static -pie --no-dynamic-linker -z notext 77endif 78 79cflags-y += -ffreestanding 80cflags-y += $(call cc-option, -mno-check-zero-division) 81 82load-y = 0x9000000000200000 83bootvars-y = VMLINUX_LOAD_ADDRESS=$(load-y) 84 85drivers-$(CONFIG_PCI) += arch/loongarch/pci/ 86 87KBUILD_AFLAGS += $(cflags-y) 88KBUILD_CFLAGS += $(cflags-y) 89KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y) 90 91# This is required to get dwarf unwinding tables into .debug_frame 92# instead of .eh_frame so we don't discard them. 93KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 94 95ifdef CONFIG_ARCH_STRICT_ALIGN 96# Don't emit unaligned accesses. 97# Not all LoongArch cores support unaligned access, and as kernel we can't 98# rely on others to provide emulation for these accesses. 99KBUILD_CFLAGS += $(call cc-option,-mstrict-align) 100else 101# Optimise for performance on hardware supports unaligned access. 102KBUILD_CFLAGS += $(call cc-option,-mno-strict-align) 103endif 104 105KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include) 106 107KBUILD_LDFLAGS += -m $(ld-emul) 108 109ifdef CONFIG_LOONGARCH 110CHECKFLAGS += $(shell $(CC) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \ 111 grep -E -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \ 112 sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g') 113endif 114 115libs-y += arch/loongarch/lib/ 116libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 117 118# suspend and hibernation support 119drivers-$(CONFIG_PM) += arch/loongarch/power/ 120 121ifeq ($(KBUILD_EXTMOD),) 122prepare: vdso_prepare 123vdso_prepare: prepare0 124 $(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h 125endif 126 127PHONY += vdso_install 128vdso_install: 129 $(Q)$(MAKE) $(build)=arch/loongarch/vdso $@ 130 131all: $(notdir $(KBUILD_IMAGE)) 132 133vmlinux.elf vmlinux.efi vmlinuz.efi: vmlinux 134 $(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $(boot)/$@ 135 136install: 137 $(Q)install -D -m 755 $(KBUILD_IMAGE) $(INSTALL_PATH)/$(image-name-y)-$(KERNELRELEASE) 138 $(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE) 139 $(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE) 140 141define archhelp 142 echo ' install - install kernel into $(INSTALL_PATH)' 143 echo 144endef 145