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 ($(CONFIG_ARCH_RV64I),y) 30 BITS := 64 31 UTS_MACHINE := riscv64 32 33 KBUILD_CFLAGS += -mabi=lp64 34 KBUILD_AFLAGS += -mabi=lp64 35 36 KBUILD_LDFLAGS += -melf64lriscv 37 38 KBUILD_RUSTFLAGS += -Ctarget-cpu=generic-rv64 --target=riscv64imac-unknown-none-elf \ 39 -Cno-redzone 40else 41 BITS := 32 42 UTS_MACHINE := riscv32 43 44 KBUILD_CFLAGS += -mabi=ilp32 45 KBUILD_AFLAGS += -mabi=ilp32 46 KBUILD_LDFLAGS += -melf32lriscv 47endif 48 49ifndef CONFIG_RISCV_USE_LINKER_RELAXATION 50 KBUILD_CFLAGS += -mno-relax 51 KBUILD_AFLAGS += -mno-relax 52ifndef CONFIG_AS_IS_LLVM 53 KBUILD_CFLAGS += -Wa,-mno-relax 54 KBUILD_AFLAGS += -Wa,-mno-relax 55endif 56# LLVM has an issue with target-features and LTO: https://github.com/llvm/llvm-project/issues/59350 57# Ensure it is aware of linker relaxation with LTO, otherwise relocations may 58# be incorrect: https://github.com/llvm/llvm-project/issues/65090 59else ifeq ($(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 $(riscv-march-y) | sed -E 's/(rv32ima|rv64ima)([^v_]*)v?/\1\2/') 99 100KBUILD_CFLAGS += -mno-save-restore 101 102ifeq ($(CONFIG_CMODEL_MEDLOW),y) 103 KBUILD_CFLAGS += -mcmodel=medlow 104endif 105ifeq ($(CONFIG_CMODEL_MEDANY),y) 106 KBUILD_CFLAGS += -mcmodel=medany 107endif 108 109# Avoid generating .eh_frame sections. 110KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 111 112# The RISC-V attributes frequently cause compatibility issues and provide no 113# information, so just turn them off. 114KBUILD_CFLAGS += $(call cc-option,-mno-riscv-attribute) 115KBUILD_AFLAGS += $(call cc-option,-mno-riscv-attribute) 116KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr) 117KBUILD_AFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr) 118 119KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax) 120KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax) 121 122# GCC versions that support the "-mstrict-align" option default to allowing 123# unaligned accesses. While unaligned accesses are explicitly allowed in the 124# RISC-V ISA, they're emulated by machine mode traps on all extant 125# architectures. It's faster to have GCC emit only aligned accesses. 126ifneq ($(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS),y) 127KBUILD_CFLAGS += $(call cc-option,-mstrict-align) 128endif 129 130ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 131prepare: stack_protector_prepare 132stack_protector_prepare: prepare0 133 $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls \ 134 -mstack-protector-guard-reg=tp \ 135 -mstack-protector-guard-offset=$(shell \ 136 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ 137 $(objtree)/include/generated/asm-offsets.h)) 138endif 139 140# arch specific predefines for sparse 141CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS) 142 143# Default target when executing plain make 144boot := arch/riscv/boot 145ifeq ($(CONFIG_XIP_KERNEL),y) 146KBUILD_IMAGE := $(boot)/xipImage 147else 148ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN_K210),yy) 149KBUILD_IMAGE := $(boot)/loader.bin 150else 151ifeq ($(CONFIG_EFI_ZBOOT),) 152KBUILD_IMAGE := $(boot)/Image.gz 153else 154KBUILD_IMAGE := $(boot)/vmlinuz.efi 155endif 156endif 157endif 158 159boot := arch/riscv/boot 160boot-image-y := Image 161boot-image-$(CONFIG_KERNEL_BZIP2) := Image.bz2 162boot-image-$(CONFIG_KERNEL_GZIP) := Image.gz 163boot-image-$(CONFIG_KERNEL_LZ4) := Image.lz4 164boot-image-$(CONFIG_KERNEL_LZMA) := Image.lzma 165boot-image-$(CONFIG_KERNEL_LZO) := Image.lzo 166boot-image-$(CONFIG_KERNEL_ZSTD) := Image.zst 167boot-image-$(CONFIG_KERNEL_XZ) := Image.xz 168ifdef CONFIG_RISCV_M_MODE 169boot-image-$(CONFIG_ARCH_CANAAN) := loader.bin 170endif 171boot-image-$(CONFIG_EFI_ZBOOT) := vmlinuz.efi 172boot-image-$(CONFIG_XIP_KERNEL) := xipImage 173KBUILD_IMAGE := $(boot)/$(boot-image-y) 174 175libs-y += arch/riscv/lib/ 176libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 177 178ifeq ($(KBUILD_EXTMOD),) 179ifeq ($(CONFIG_MMU),y) 180prepare: vdso_prepare 181vdso_prepare: prepare0 182 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h 183 $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \ 184 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h) 185 186endif 187endif 188 189vdso-install-y += arch/riscv/kernel/vdso/vdso.so.dbg 190vdso-install-$(CONFIG_COMPAT) += arch/riscv/kernel/compat_vdso/compat_vdso.so.dbg 191 192BOOT_TARGETS := Image Image.gz Image.bz2 Image.lz4 Image.lzma Image.lzo Image.zst Image.xz loader loader.bin xipImage vmlinuz.efi 193 194all: $(notdir $(KBUILD_IMAGE)) 195 196loader.bin: loader 197Image.gz Image.bz2 Image.lz4 Image.lzma Image.lzo Image.zst Image.xz loader xipImage vmlinuz.efi: Image 198 199$(BOOT_TARGETS): vmlinux 200 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 201 @$(kecho) ' Kernel: $(boot)/$@ is ready' 202 203# the install target always installs KBUILD_IMAGE (which may be compressed) 204# but keep the zinstall target for compatibility with older releases 205install zinstall: 206 $(call cmd,install) 207 208PHONY += rv32_randconfig 209rv32_randconfig: 210 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \ 211 -f $(srctree)/Makefile randconfig 212 213PHONY += rv64_randconfig 214rv64_randconfig: 215 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \ 216 -f $(srctree)/Makefile randconfig 217 218PHONY += rv32_defconfig 219rv32_defconfig: 220 $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config 221 222PHONY += rv32_nommu_virt_defconfig 223rv32_nommu_virt_defconfig: 224 $(Q)$(MAKE) -f $(srctree)/Makefile nommu_virt_defconfig 32-bit.config 225 226define archhelp 227 echo ' Image - Uncompressed kernel image (arch/riscv/boot/Image)' 228 echo ' Image.gz - Compressed kernel image (arch/riscv/boot/Image.gz)' 229 echo ' Image.bz2 - Compressed kernel image (arch/riscv/boot/Image.bz2)' 230 echo ' Image.lz4 - Compressed kernel image (arch/riscv/boot/Image.lz4)' 231 echo ' Image.lzma - Compressed kernel image (arch/riscv/boot/Image.lzma)' 232 echo ' Image.lzo - Compressed kernel image (arch/riscv/boot/Image.lzo)' 233 echo ' Image.zst - Compressed kernel image (arch/riscv/boot/Image.zst)' 234 echo ' Image.xz - Compressed kernel image (arch/riscv/boot/Image.xz)' 235 echo ' vmlinuz.efi - Compressed EFI kernel image (arch/riscv/boot/vmlinuz.efi)' 236 echo ' Default when CONFIG_EFI_ZBOOT=y' 237 echo ' xipImage - Execute-in-place kernel image (arch/riscv/boot/xipImage)' 238 echo ' Default when CONFIG_XIP_KERNEL=y' 239 echo ' install - Install kernel using (your) ~/bin/$(INSTALLKERNEL) or' 240 echo ' (distribution) /sbin/$(INSTALLKERNEL) or install to ' 241 echo ' $$(INSTALL_PATH)' 242endef 243