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