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) := $(riscv-march-y)_zicsr_zifencei 83endif 84 85# Check if the toolchain supports Zihintpause extension 86riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE) := $(riscv-march-y)_zihintpause 87 88# Remove F,D,V from isa string for all. Keep extensions between "fd" and "v" by 89# matching non-v and non-multi-letter extensions out with the filter ([^v_]*) 90KBUILD_CFLAGS += -march=$(shell echo $(riscv-march-y) | sed -E 's/(rv32ima|rv64ima)fd([^v_]*)v?/\1\2/') 91 92KBUILD_AFLAGS += -march=$(riscv-march-y) 93 94# For C code built with floating-point support, exclude V but keep F and D. 95CC_FLAGS_FPU := -march=$(shell echo $(riscv-march-y) | sed -E 's/(rv32ima|rv64ima)([^v_]*)v?/\1\2/') 96 97KBUILD_CFLAGS += -mno-save-restore 98KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET) 99 100ifeq ($(CONFIG_CMODEL_MEDLOW),y) 101 KBUILD_CFLAGS += -mcmodel=medlow 102endif 103ifeq ($(CONFIG_CMODEL_MEDANY),y) 104 KBUILD_CFLAGS += -mcmodel=medany 105endif 106 107# Avoid generating .eh_frame sections. 108KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 109 110# The RISC-V attributes frequently cause compatibility issues and provide no 111# information, so just turn them off. 112KBUILD_CFLAGS += $(call cc-option,-mno-riscv-attribute) 113KBUILD_AFLAGS += $(call cc-option,-mno-riscv-attribute) 114KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr) 115KBUILD_AFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr) 116 117KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax) 118KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax) 119 120# GCC versions that support the "-mstrict-align" option default to allowing 121# unaligned accesses. While unaligned accesses are explicitly allowed in the 122# RISC-V ISA, they're emulated by machine mode traps on all extant 123# architectures. It's faster to have GCC emit only aligned accesses. 124ifneq ($(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS),y) 125KBUILD_CFLAGS += $(call cc-option,-mstrict-align) 126endif 127 128ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 129prepare: stack_protector_prepare 130stack_protector_prepare: prepare0 131 $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls \ 132 -mstack-protector-guard-reg=tp \ 133 -mstack-protector-guard-offset=$(shell \ 134 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ 135 include/generated/asm-offsets.h)) 136endif 137 138# arch specific predefines for sparse 139CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS) 140 141# Default target when executing plain make 142boot := arch/riscv/boot 143ifeq ($(CONFIG_XIP_KERNEL),y) 144KBUILD_IMAGE := $(boot)/xipImage 145else 146ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN_K210),yy) 147KBUILD_IMAGE := $(boot)/loader.bin 148else 149ifeq ($(CONFIG_EFI_ZBOOT),) 150KBUILD_IMAGE := $(boot)/Image.gz 151else 152KBUILD_IMAGE := $(boot)/vmlinuz.efi 153endif 154endif 155endif 156 157boot := arch/riscv/boot 158boot-image-y := Image 159boot-image-$(CONFIG_KERNEL_BZIP2) := Image.bz2 160boot-image-$(CONFIG_KERNEL_GZIP) := Image.gz 161boot-image-$(CONFIG_KERNEL_LZ4) := Image.lz4 162boot-image-$(CONFIG_KERNEL_LZMA) := Image.lzma 163boot-image-$(CONFIG_KERNEL_LZO) := Image.lzo 164boot-image-$(CONFIG_KERNEL_ZSTD) := Image.zst 165ifdef CONFIG_RISCV_M_MODE 166boot-image-$(CONFIG_ARCH_CANAAN) := loader.bin 167endif 168boot-image-$(CONFIG_EFI_ZBOOT) := vmlinuz.efi 169boot-image-$(CONFIG_XIP_KERNEL) := xipImage 170KBUILD_IMAGE := $(boot)/$(boot-image-y) 171 172libs-y += arch/riscv/lib/ 173libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 174 175ifeq ($(KBUILD_EXTMOD),) 176ifeq ($(CONFIG_MMU),y) 177prepare: vdso_prepare 178vdso_prepare: prepare0 179 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h 180 $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \ 181 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h) 182 183endif 184endif 185 186vdso-install-y += arch/riscv/kernel/vdso/vdso.so.dbg 187vdso-install-$(CONFIG_COMPAT) += arch/riscv/kernel/compat_vdso/compat_vdso.so.dbg 188 189BOOT_TARGETS := Image Image.gz Image.bz2 Image.lz4 Image.lzma Image.lzo Image.zst loader loader.bin xipImage vmlinuz.efi 190 191all: $(notdir $(KBUILD_IMAGE)) 192 193loader.bin: loader 194Image.gz Image.bz2 Image.lz4 Image.lzma Image.lzo Image.zst loader xipImage vmlinuz.efi: Image 195 196$(BOOT_TARGETS): vmlinux 197 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 198 @$(kecho) ' Kernel: $(boot)/$@ is ready' 199 200# the install target always installs KBUILD_IMAGE (which may be compressed) 201# but keep the zinstall target for compatibility with older releases 202install zinstall: 203 $(call cmd,install) 204 205PHONY += rv32_randconfig 206rv32_randconfig: 207 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \ 208 -f $(srctree)/Makefile randconfig 209 210PHONY += rv64_randconfig 211rv64_randconfig: 212 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \ 213 -f $(srctree)/Makefile randconfig 214 215PHONY += rv32_defconfig 216rv32_defconfig: 217 $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config 218 219PHONY += rv32_nommu_virt_defconfig 220rv32_nommu_virt_defconfig: 221 $(Q)$(MAKE) -f $(srctree)/Makefile nommu_virt_defconfig 32-bit.config 222 223define archhelp 224 echo ' Image - Uncompressed kernel image (arch/riscv/boot/Image)' 225 echo ' Image.gz - Compressed kernel image (arch/riscv/boot/Image.gz)' 226 echo ' Image.bz2 - Compressed kernel image (arch/riscv/boot/Image.bz2)' 227 echo ' Image.lz4 - Compressed kernel image (arch/riscv/boot/Image.lz4)' 228 echo ' Image.lzma - Compressed kernel image (arch/riscv/boot/Image.lzma)' 229 echo ' Image.lzo - Compressed kernel image (arch/riscv/boot/Image.lzo)' 230 echo ' Image.zst - Compressed kernel image (arch/riscv/boot/Image.zst)' 231 echo ' vmlinuz.efi - Compressed EFI kernel image (arch/riscv/boot/vmlinuz.efi)' 232 echo ' Default when CONFIG_EFI_ZBOOT=y' 233 echo ' xipImage - Execute-in-place kernel image (arch/riscv/boot/xipImage)' 234 echo ' Default when CONFIG_XIP_KERNEL=y' 235 echo ' install - Install kernel using (your) ~/bin/$(INSTALLKERNEL) or' 236 echo ' (distribution) /sbin/$(INSTALLKERNEL) or install to ' 237 echo ' $$(INSTALL_PATH)' 238endef 239