1# This file is included by the global makefile so that you can add your own 2# architecture-specific flags and dependencies. 3# 4# This file is subject to the terms and conditions of the GNU General Public 5# License. See the file "COPYING" in the main directory of this archive 6# for more details. 7# 8 9LDFLAGS_vmlinux := -z norelro 10ifeq ($(CONFIG_RELOCATABLE),y) 11 LDFLAGS_vmlinux += -shared -Bsymbolic -z notext --emit-relocs 12 KBUILD_CFLAGS += -fPIE 13endif 14ifeq ($(CONFIG_DYNAMIC_FTRACE),y) 15 LDFLAGS_vmlinux += --no-relax 16 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 17ifeq ($(CONFIG_RISCV_ISA_C),y) 18 CC_FLAGS_FTRACE := -fpatchable-function-entry=4 19else 20 CC_FLAGS_FTRACE := -fpatchable-function-entry=2 21endif 22endif 23 24ifeq ($(CONFIG_CMODEL_MEDLOW),y) 25KBUILD_CFLAGS_MODULE += -mcmodel=medany 26endif 27 28export BITS 29ifeq ($(CONFIG_ARCH_RV64I),y) 30 BITS := 64 31 UTS_MACHINE := riscv64 32 33 KBUILD_CFLAGS += -mabi=lp64 34 KBUILD_AFLAGS += -mabi=lp64 35 36 KBUILD_LDFLAGS += -melf64lriscv 37 38 KBUILD_RUSTFLAGS += -Ctarget-cpu=generic-rv64 --target=riscv64imac-unknown-none-elf \ 39 -Cno-redzone 40else 41 BITS := 32 42 UTS_MACHINE := riscv32 43 44 KBUILD_CFLAGS += -mabi=ilp32 45 KBUILD_AFLAGS += -mabi=ilp32 46 KBUILD_LDFLAGS += -melf32lriscv 47endif 48 49ifndef CONFIG_RISCV_USE_LINKER_RELAXATION 50 KBUILD_CFLAGS += -mno-relax 51 KBUILD_AFLAGS += -mno-relax 52ifndef CONFIG_AS_IS_LLVM 53 KBUILD_CFLAGS += -Wa,-mno-relax 54 KBUILD_AFLAGS += -Wa,-mno-relax 55endif 56# LLVM has an issue with target-features and LTO: https://github.com/llvm/llvm-project/issues/59350 57# Ensure it is aware of linker relaxation with LTO, otherwise relocations may 58# be incorrect: https://github.com/llvm/llvm-project/issues/65090 59else ifeq ($(CONFIG_LTO_CLANG),y) 60 KBUILD_LDFLAGS += -mllvm -mattr=+c -mllvm -mattr=+relax 61endif 62 63ifeq ($(CONFIG_SHADOW_CALL_STACK),y) 64 KBUILD_LDFLAGS += --no-relax-gp 65endif 66 67# ISA string setting 68riscv-march-$(CONFIG_ARCH_RV32I) := rv32ima 69riscv-march-$(CONFIG_ARCH_RV64I) := rv64ima 70riscv-march-$(CONFIG_FPU) := $(riscv-march-y)fd 71riscv-march-$(CONFIG_RISCV_ISA_C) := $(riscv-march-y)c 72riscv-march-$(CONFIG_RISCV_ISA_V) := $(riscv-march-y)v 73 74ifneq ($(CONFIG_RISCV_ISA_C),y) 75 KBUILD_RUSTFLAGS += -Ctarget-feature=-c 76endif 77 78ifdef CONFIG_TOOLCHAIN_NEEDS_OLD_ISA_SPEC 79KBUILD_CFLAGS += -Wa,-misa-spec=2.2 80KBUILD_AFLAGS += -Wa,-misa-spec=2.2 81else 82riscv-march-$(CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI) := $(riscv-march-y)_zicsr_zifencei 83endif 84 85# Check if the toolchain supports Zacas 86riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZACAS) := $(riscv-march-y)_zacas 87 88# Check if the toolchain supports Zabha 89riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZABHA) := $(riscv-march-y)_zabha 90 91# Remove F,D,V from isa string for all. Keep extensions between "fd" and "v" by 92# matching non-v and non-multi-letter extensions out with the filter ([^v_]*) 93KBUILD_CFLAGS += -march=$(shell echo $(riscv-march-y) | sed -E 's/(rv32ima|rv64ima)fd([^v_]*)v?/\1\2/') 94 95KBUILD_AFLAGS += -march=$(riscv-march-y) 96 97# For C code built with floating-point support, exclude V but keep F and D. 98CC_FLAGS_FPU := -march=$(shell echo $(riscv-march-y) | sed -E 's/(rv32ima|rv64ima)([^v_]*)v?/\1\2/') 99 100KBUILD_CFLAGS += -mno-save-restore 101KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET) 102 103ifeq ($(CONFIG_CMODEL_MEDLOW),y) 104 KBUILD_CFLAGS += -mcmodel=medlow 105endif 106ifeq ($(CONFIG_CMODEL_MEDANY),y) 107 KBUILD_CFLAGS += -mcmodel=medany 108endif 109 110# Avoid generating .eh_frame sections. 111KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 112 113# The RISC-V attributes frequently cause compatibility issues and provide no 114# information, so just turn them off. 115KBUILD_CFLAGS += $(call cc-option,-mno-riscv-attribute) 116KBUILD_AFLAGS += $(call cc-option,-mno-riscv-attribute) 117KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr) 118KBUILD_AFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr) 119 120KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax) 121KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax) 122 123# GCC versions that support the "-mstrict-align" option default to allowing 124# unaligned accesses. While unaligned accesses are explicitly allowed in the 125# RISC-V ISA, they're emulated by machine mode traps on all extant 126# architectures. It's faster to have GCC emit only aligned accesses. 127ifneq ($(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS),y) 128KBUILD_CFLAGS += $(call cc-option,-mstrict-align) 129endif 130 131ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 132prepare: stack_protector_prepare 133stack_protector_prepare: prepare0 134 $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls \ 135 -mstack-protector-guard-reg=tp \ 136 -mstack-protector-guard-offset=$(shell \ 137 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ 138 $(objtree)/include/generated/asm-offsets.h)) 139endif 140 141# arch specific predefines for sparse 142CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS) 143 144# Default target when executing plain make 145boot := arch/riscv/boot 146ifeq ($(CONFIG_XIP_KERNEL),y) 147KBUILD_IMAGE := $(boot)/xipImage 148else 149ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN_K210),yy) 150KBUILD_IMAGE := $(boot)/loader.bin 151else 152ifeq ($(CONFIG_EFI_ZBOOT),) 153KBUILD_IMAGE := $(boot)/Image.gz 154else 155KBUILD_IMAGE := $(boot)/vmlinuz.efi 156endif 157endif 158endif 159 160boot := arch/riscv/boot 161boot-image-y := Image 162boot-image-$(CONFIG_KERNEL_BZIP2) := Image.bz2 163boot-image-$(CONFIG_KERNEL_GZIP) := Image.gz 164boot-image-$(CONFIG_KERNEL_LZ4) := Image.lz4 165boot-image-$(CONFIG_KERNEL_LZMA) := Image.lzma 166boot-image-$(CONFIG_KERNEL_LZO) := Image.lzo 167boot-image-$(CONFIG_KERNEL_ZSTD) := Image.zst 168boot-image-$(CONFIG_KERNEL_XZ) := Image.xz 169ifdef CONFIG_RISCV_M_MODE 170boot-image-$(CONFIG_ARCH_CANAAN) := loader.bin 171endif 172boot-image-$(CONFIG_EFI_ZBOOT) := vmlinuz.efi 173boot-image-$(CONFIG_XIP_KERNEL) := xipImage 174KBUILD_IMAGE := $(boot)/$(boot-image-y) 175 176libs-y += arch/riscv/lib/ 177libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 178 179ifeq ($(KBUILD_EXTMOD),) 180ifeq ($(CONFIG_MMU),y) 181prepare: vdso_prepare 182vdso_prepare: prepare0 183 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h 184 $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \ 185 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h) 186 187endif 188endif 189 190vdso-install-y += arch/riscv/kernel/vdso/vdso.so.dbg 191vdso-install-$(CONFIG_COMPAT) += arch/riscv/kernel/compat_vdso/compat_vdso.so.dbg 192 193BOOT_TARGETS := Image Image.gz Image.bz2 Image.lz4 Image.lzma Image.lzo Image.zst Image.xz loader loader.bin xipImage vmlinuz.efi 194 195all: $(notdir $(KBUILD_IMAGE)) 196 197loader.bin: loader 198Image.gz Image.bz2 Image.lz4 Image.lzma Image.lzo Image.zst Image.xz loader xipImage vmlinuz.efi: Image 199 200$(BOOT_TARGETS): vmlinux 201 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 202 @$(kecho) ' Kernel: $(boot)/$@ is ready' 203 204# the install target always installs KBUILD_IMAGE (which may be compressed) 205# but keep the zinstall target for compatibility with older releases 206install zinstall: 207 $(call cmd,install) 208 209PHONY += rv32_randconfig 210rv32_randconfig: 211 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \ 212 -f $(srctree)/Makefile randconfig 213 214PHONY += rv64_randconfig 215rv64_randconfig: 216 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \ 217 -f $(srctree)/Makefile randconfig 218 219PHONY += rv32_defconfig 220rv32_defconfig: 221 $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config 222 223PHONY += rv32_nommu_virt_defconfig 224rv32_nommu_virt_defconfig: 225 $(Q)$(MAKE) -f $(srctree)/Makefile nommu_virt_defconfig 32-bit.config 226 227define archhelp 228 echo ' Image - Uncompressed kernel image (arch/riscv/boot/Image)' 229 echo ' Image.gz - Compressed kernel image (arch/riscv/boot/Image.gz)' 230 echo ' Image.bz2 - Compressed kernel image (arch/riscv/boot/Image.bz2)' 231 echo ' Image.lz4 - Compressed kernel image (arch/riscv/boot/Image.lz4)' 232 echo ' Image.lzma - Compressed kernel image (arch/riscv/boot/Image.lzma)' 233 echo ' Image.lzo - Compressed kernel image (arch/riscv/boot/Image.lzo)' 234 echo ' Image.zst - Compressed kernel image (arch/riscv/boot/Image.zst)' 235 echo ' Image.xz - Compressed kernel image (arch/riscv/boot/Image.xz)' 236 echo ' vmlinuz.efi - Compressed EFI kernel image (arch/riscv/boot/vmlinuz.efi)' 237 echo ' Default when CONFIG_EFI_ZBOOT=y' 238 echo ' xipImage - Execute-in-place kernel image (arch/riscv/boot/xipImage)' 239 echo ' Default when CONFIG_XIP_KERNEL=y' 240 echo ' install - Install kernel using (your) ~/bin/$(INSTALLKERNEL) or' 241 echo ' (distribution) /sbin/$(INSTALLKERNEL) or install to ' 242 echo ' $$(INSTALL_PATH)' 243endef 244