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 9OBJCOPYFLAGS := -O binary 10LDFLAGS_vmlinux := 11ifeq ($(CONFIG_DYNAMIC_FTRACE),y) 12 LDFLAGS_vmlinux := --no-relax 13 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 14 CC_FLAGS_FTRACE := -fpatchable-function-entry=8 15endif 16 17ifeq ($(CONFIG_CMODEL_MEDLOW),y) 18KBUILD_CFLAGS_MODULE += -mcmodel=medany 19endif 20 21export BITS 22ifeq ($(CONFIG_ARCH_RV64I),y) 23 BITS := 64 24 UTS_MACHINE := riscv64 25 26 KBUILD_CFLAGS += -mabi=lp64 27 KBUILD_AFLAGS += -mabi=lp64 28 29 KBUILD_LDFLAGS += -melf64lriscv 30else 31 BITS := 32 32 UTS_MACHINE := riscv32 33 34 KBUILD_CFLAGS += -mabi=ilp32 35 KBUILD_AFLAGS += -mabi=ilp32 36 KBUILD_LDFLAGS += -melf32lriscv 37endif 38 39ifeq ($(CONFIG_LD_IS_LLD),y) 40ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 150000; echo $$?),0) 41 KBUILD_CFLAGS += -mno-relax 42 KBUILD_AFLAGS += -mno-relax 43ifndef CONFIG_AS_IS_LLVM 44 KBUILD_CFLAGS += -Wa,-mno-relax 45 KBUILD_AFLAGS += -Wa,-mno-relax 46endif 47endif 48endif 49 50# ISA string setting 51riscv-march-$(CONFIG_ARCH_RV32I) := rv32ima 52riscv-march-$(CONFIG_ARCH_RV64I) := rv64ima 53riscv-march-$(CONFIG_FPU) := $(riscv-march-y)fd 54riscv-march-$(CONFIG_RISCV_ISA_C) := $(riscv-march-y)c 55 56# Newer binutils versions default to ISA spec version 20191213 which moves some 57# instructions from the I extension to the Zicsr and Zifencei extensions. 58toolchain-need-zicsr-zifencei := $(call cc-option-yn, -march=$(riscv-march-y)_zicsr_zifencei) 59riscv-march-$(toolchain-need-zicsr-zifencei) := $(riscv-march-y)_zicsr_zifencei 60 61# Check if the toolchain supports Zicbom extension 62toolchain-supports-zicbom := $(call cc-option-yn, -march=$(riscv-march-y)_zicbom) 63riscv-march-$(toolchain-supports-zicbom) := $(riscv-march-y)_zicbom 64 65# Check if the toolchain supports Zihintpause extension 66toolchain-supports-zihintpause := $(call cc-option-yn, -march=$(riscv-march-y)_zihintpause) 67riscv-march-$(toolchain-supports-zihintpause) := $(riscv-march-y)_zihintpause 68 69KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y)) 70KBUILD_AFLAGS += -march=$(riscv-march-y) 71 72KBUILD_CFLAGS += -mno-save-restore 73KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET) 74 75ifeq ($(CONFIG_CMODEL_MEDLOW),y) 76 KBUILD_CFLAGS += -mcmodel=medlow 77endif 78ifeq ($(CONFIG_CMODEL_MEDANY),y) 79 KBUILD_CFLAGS += -mcmodel=medany 80endif 81ifeq ($(CONFIG_PERF_EVENTS),y) 82 KBUILD_CFLAGS += -fno-omit-frame-pointer 83endif 84 85KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax) 86KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax) 87 88# GCC versions that support the "-mstrict-align" option default to allowing 89# unaligned accesses. While unaligned accesses are explicitly allowed in the 90# RISC-V ISA, they're emulated by machine mode traps on all extant 91# architectures. It's faster to have GCC emit only aligned accesses. 92KBUILD_CFLAGS += $(call cc-option,-mstrict-align) 93 94ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 95prepare: stack_protector_prepare 96stack_protector_prepare: prepare0 97 $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls \ 98 -mstack-protector-guard-reg=tp \ 99 -mstack-protector-guard-offset=$(shell \ 100 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ 101 include/generated/asm-offsets.h)) 102endif 103 104# arch specific predefines for sparse 105CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS) 106 107# Default target when executing plain make 108boot := arch/riscv/boot 109ifeq ($(CONFIG_XIP_KERNEL),y) 110KBUILD_IMAGE := $(boot)/xipImage 111else 112KBUILD_IMAGE := $(boot)/Image.gz 113endif 114 115libs-y += arch/riscv/lib/ 116libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 117 118PHONY += vdso_install 119vdso_install: 120 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@ 121 $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \ 122 $(build)=arch/riscv/kernel/compat_vdso compat_$@) 123 124ifeq ($(KBUILD_EXTMOD),) 125ifeq ($(CONFIG_MMU),y) 126prepare: vdso_prepare 127vdso_prepare: prepare0 128 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h 129 $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \ 130 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h) 131 132endif 133endif 134 135ifneq ($(CONFIG_XIP_KERNEL),y) 136ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN),yy) 137KBUILD_IMAGE := $(boot)/loader.bin 138else 139ifeq ($(CONFIG_EFI_ZBOOT),) 140KBUILD_IMAGE := $(boot)/Image.gz 141else 142KBUILD_IMAGE := $(boot)/vmlinuz.efi 143endif 144endif 145endif 146BOOT_TARGETS := Image Image.gz loader loader.bin xipImage vmlinuz.efi 147 148all: $(notdir $(KBUILD_IMAGE)) 149 150$(BOOT_TARGETS): vmlinux 151 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 152 @$(kecho) ' Kernel: $(boot)/$@ is ready' 153 154Image.%: Image 155 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 156 157install: KBUILD_IMAGE := $(boot)/Image 158zinstall: KBUILD_IMAGE := $(boot)/Image.gz 159install zinstall: 160 $(call cmd,install) 161 162PHONY += rv32_randconfig 163rv32_randconfig: 164 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \ 165 -f $(srctree)/Makefile randconfig 166 167PHONY += rv64_randconfig 168rv64_randconfig: 169 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \ 170 -f $(srctree)/Makefile randconfig 171 172PHONY += rv32_defconfig 173rv32_defconfig: 174 $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config 175