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) 40 KBUILD_CFLAGS += -mno-relax 41 KBUILD_AFLAGS += -mno-relax 42ifndef CONFIG_AS_IS_LLVM 43 KBUILD_CFLAGS += -Wa,-mno-relax 44 KBUILD_AFLAGS += -Wa,-mno-relax 45endif 46endif 47 48# ISA string setting 49riscv-march-$(CONFIG_ARCH_RV32I) := rv32ima 50riscv-march-$(CONFIG_ARCH_RV64I) := rv64ima 51riscv-march-$(CONFIG_FPU) := $(riscv-march-y)fd 52riscv-march-$(CONFIG_RISCV_ISA_C) := $(riscv-march-y)c 53 54# Newer binutils versions default to ISA spec version 20191213 which moves some 55# instructions from the I extension to the Zicsr and Zifencei extensions. 56toolchain-need-zicsr-zifencei := $(call cc-option-yn, -march=$(riscv-march-y)_zicsr_zifencei) 57riscv-march-$(toolchain-need-zicsr-zifencei) := $(riscv-march-y)_zicsr_zifencei 58 59# Check if the toolchain supports Zicbom extension 60toolchain-supports-zicbom := $(call cc-option-yn, -march=$(riscv-march-y)_zicbom) 61riscv-march-$(toolchain-supports-zicbom) := $(riscv-march-y)_zicbom 62 63# Check if the toolchain supports Zihintpause extension 64toolchain-supports-zihintpause := $(call cc-option-yn, -march=$(riscv-march-y)_zihintpause) 65riscv-march-$(toolchain-supports-zihintpause) := $(riscv-march-y)_zihintpause 66 67KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y)) 68KBUILD_AFLAGS += -march=$(riscv-march-y) 69 70KBUILD_CFLAGS += -mno-save-restore 71KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET) 72 73ifeq ($(CONFIG_CMODEL_MEDLOW),y) 74 KBUILD_CFLAGS += -mcmodel=medlow 75endif 76ifeq ($(CONFIG_CMODEL_MEDANY),y) 77 KBUILD_CFLAGS += -mcmodel=medany 78endif 79ifeq ($(CONFIG_PERF_EVENTS),y) 80 KBUILD_CFLAGS += -fno-omit-frame-pointer 81endif 82 83KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax) 84KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax) 85 86# GCC versions that support the "-mstrict-align" option default to allowing 87# unaligned accesses. While unaligned accesses are explicitly allowed in the 88# RISC-V ISA, they're emulated by machine mode traps on all extant 89# architectures. It's faster to have GCC emit only aligned accesses. 90KBUILD_CFLAGS += $(call cc-option,-mstrict-align) 91 92ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 93prepare: stack_protector_prepare 94stack_protector_prepare: prepare0 95 $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls \ 96 -mstack-protector-guard-reg=tp \ 97 -mstack-protector-guard-offset=$(shell \ 98 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ 99 include/generated/asm-offsets.h)) 100endif 101 102# arch specific predefines for sparse 103CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS) 104 105# Default target when executing plain make 106boot := arch/riscv/boot 107ifeq ($(CONFIG_XIP_KERNEL),y) 108KBUILD_IMAGE := $(boot)/xipImage 109else 110KBUILD_IMAGE := $(boot)/Image.gz 111endif 112 113head-y := arch/riscv/kernel/head.o 114 115libs-y += arch/riscv/lib/ 116libs-$(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 139KBUILD_IMAGE := $(boot)/Image.gz 140endif 141endif 142BOOT_TARGETS := Image Image.gz loader loader.bin xipImage 143 144all: $(notdir $(KBUILD_IMAGE)) 145 146$(BOOT_TARGETS): vmlinux 147 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 148 @$(kecho) ' Kernel: $(boot)/$@ is ready' 149 150Image.%: Image 151 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 152 153install: KBUILD_IMAGE := $(boot)/Image 154zinstall: KBUILD_IMAGE := $(boot)/Image.gz 155install zinstall: 156 $(call cmd,install) 157 158PHONY += rv32_randconfig 159rv32_randconfig: 160 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \ 161 -f $(srctree)/Makefile randconfig 162 163PHONY += rv64_randconfig 164rv64_randconfig: 165 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \ 166 -f $(srctree)/Makefile randconfig 167 168PHONY += rv32_defconfig 169rv32_defconfig: 170 $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config 171