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 29CC_FLAGS_FPU := -mfpu=64 30CC_FLAGS_NO_FPU := -msoft-float 31 32ifdef CONFIG_UNWINDER_ORC 33orc_hash_h := arch/$(SRCARCH)/include/generated/asm/orc_hash.h 34orc_hash_sh := $(srctree)/scripts/orc_hash.sh 35targets += $(orc_hash_h) 36quiet_cmd_orc_hash = GEN $@ 37 cmd_orc_hash = mkdir -p $(dir $@); \ 38 $(CONFIG_SHELL) $(orc_hash_sh) < $< > $@ 39$(orc_hash_h): $(srctree)/arch/loongarch/include/asm/orc_types.h $(orc_hash_sh) FORCE 40 $(call if_changed,orc_hash) 41archprepare: $(orc_hash_h) 42endif 43 44ifdef CONFIG_DYNAMIC_FTRACE 45KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 46CC_FLAGS_FTRACE := -fpatchable-function-entry=2 47endif 48 49ifdef CONFIG_64BIT 50tool-archpref = $(64bit-tool-archpref) 51UTS_MACHINE := loongarch64 52endif 53 54ifneq ($(SUBARCH),$(ARCH)) 55 ifeq ($(CROSS_COMPILE),) 56 CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux- $(tool-archpref)-linux-gnu- $(tool-archpref)-unknown-linux-gnu-) 57 endif 58endif 59 60ifdef CONFIG_64BIT 61ld-emul = $(64bit-emul) 62cflags-y += -mabi=lp64s -mcmodel=normal 63endif 64 65cflags-y += -pipe $(CC_FLAGS_NO_FPU) 66LDFLAGS_vmlinux += -static -n -nostdlib 67 68# When the assembler supports explicit relocation hint, we must use it. 69# GCC may have -mexplicit-relocs off by default if it was built with an old 70# assembler, so we force it via an option. 71# 72# When the assembler does not supports explicit relocation hint, we can't use 73# it. Disable it if the compiler supports it. 74# 75# The combination of a "new" assembler and "old" GCC is not supported, given 76# the rarity of this combo and the extra complexity needed to make it work. 77# Either upgrade the compiler or downgrade the assembler; the build will error 78# out if it is the case (by probing for the model attribute; all supported 79# compilers in this case would have support). 80# 81# Also, -mdirect-extern-access is useful in case of building with explicit 82# relocs, for avoiding unnecessary GOT accesses. It is harmless to not have 83# support though. 84ifdef CONFIG_AS_HAS_EXPLICIT_RELOCS 85cflags-y += $(call cc-option,-mexplicit-relocs) 86KBUILD_CFLAGS_KERNEL += $(call cc-option,-mdirect-extern-access) 87KBUILD_CFLAGS_KERNEL += $(call cc-option,-fdirect-access-external-data) 88KBUILD_AFLAGS_MODULE += $(call cc-option,-fno-direct-access-external-data) 89KBUILD_CFLAGS_MODULE += $(call cc-option,-fno-direct-access-external-data) 90else 91cflags-y += $(call cc-option,-mno-explicit-relocs) 92KBUILD_AFLAGS_KERNEL += -Wa,-mla-global-with-pcrel 93KBUILD_CFLAGS_KERNEL += -Wa,-mla-global-with-pcrel 94KBUILD_AFLAGS_MODULE += -Wa,-mla-global-with-abs 95KBUILD_CFLAGS_MODULE += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs 96endif 97 98KBUILD_AFLAGS += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax) 99KBUILD_CFLAGS += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax) 100KBUILD_AFLAGS += $(call cc-option,-mthin-add-sub) $(call cc-option,-Wa$(comma)-mthin-add-sub) 101KBUILD_CFLAGS += $(call cc-option,-mthin-add-sub) $(call cc-option,-Wa$(comma)-mthin-add-sub) 102 103ifdef CONFIG_OBJTOOL 104ifdef CONFIG_CC_HAS_ANNOTATE_TABLEJUMP 105KBUILD_CFLAGS += -mannotate-tablejump 106else 107KBUILD_CFLAGS += -fno-jump-tables # keep compatibility with older compilers 108endif 109endif 110 111KBUILD_RUSTFLAGS += --target=loongarch64-unknown-none-softfloat -Ccode-model=small 112KBUILD_RUSTFLAGS_KERNEL += -Zdirect-access-external-data=yes 113KBUILD_RUSTFLAGS_MODULE += -Zdirect-access-external-data=no 114 115ifeq ($(CONFIG_RELOCATABLE),y) 116KBUILD_CFLAGS_KERNEL += -fPIE 117KBUILD_RUSTFLAGS_KERNEL += -Crelocation-model=pie 118LDFLAGS_vmlinux += -static -pie --no-dynamic-linker -z notext $(call ld-option, --apply-dynamic-relocs) 119endif 120 121cflags-y += $(call cc-option, -mno-check-zero-division) 122 123ifndef CONFIG_KASAN 124cflags-y += -fno-builtin-memcpy -fno-builtin-memmove -fno-builtin-memset 125endif 126 127load-y = 0x9000000000200000 128bootvars-y = VMLINUX_LOAD_ADDRESS=$(load-y) 129 130drivers-$(CONFIG_PCI) += arch/loongarch/pci/ 131 132KBUILD_AFLAGS += $(cflags-y) 133KBUILD_CFLAGS += $(cflags-y) 134KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y) 135 136# This is required to get dwarf unwinding tables into .debug_frame 137# instead of .eh_frame so we don't discard them. 138KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 139 140ifdef CONFIG_ARCH_STRICT_ALIGN 141# Don't emit unaligned accesses. 142# Not all LoongArch cores support unaligned access, and as kernel we can't 143# rely on others to provide emulation for these accesses. 144KBUILD_CFLAGS += $(call cc-option,-mstrict-align) 145else 146# Optimise for performance on hardware supports unaligned access. 147KBUILD_CFLAGS += $(call cc-option,-mno-strict-align) 148endif 149 150KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include) 151 152KBUILD_LDFLAGS += -m $(ld-emul) 153 154ifdef need-compiler 155CHECKFLAGS += $(shell $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \ 156 grep -E -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \ 157 sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g') 158endif 159 160libs-y += arch/loongarch/lib/ 161libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 162 163drivers-y += arch/loongarch/crypto/ 164 165# suspend and hibernation support 166drivers-$(CONFIG_PM) += arch/loongarch/power/ 167 168ifeq ($(KBUILD_EXTMOD),) 169prepare: vdso_prepare 170vdso_prepare: prepare0 171 $(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h 172endif 173 174vdso-install-y += arch/loongarch/vdso/vdso.so.dbg 175 176all: $(notdir $(KBUILD_IMAGE)) $(KBUILD_DTBS) 177 178vmlinuz.efi: vmlinux.efi 179 180vmlinux.elf vmlinux.efi vmlinuz.efi: vmlinux 181 $(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $(boot)/$@ 182 183install: 184 $(call cmd,install) 185 186define archhelp 187 echo ' vmlinux.elf - Uncompressed ELF kernel image (arch/loongarch/boot/vmlinux.elf)' 188 echo ' vmlinux.efi - Uncompressed EFI kernel image (arch/loongarch/boot/vmlinux.efi)' 189 echo ' vmlinuz.efi - GZIP/ZSTD-compressed EFI kernel image (arch/loongarch/boot/vmlinuz.efi)' 190 echo ' Default when CONFIG_EFI_ZBOOT=y' 191 echo ' install - Install kernel using (your) ~/bin/$(INSTALLKERNEL) or' 192 echo ' (distribution) /sbin/$(INSTALLKERNEL) or install.sh to $$(INSTALL_PATH)' 193 echo 194endef 195