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) := $(riscv-march-y)_zicsr_zifencei 58 59KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y)) 60KBUILD_AFLAGS += -march=$(riscv-march-y) 61 62KBUILD_CFLAGS += -mno-save-restore 63KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET) 64 65ifeq ($(CONFIG_CMODEL_MEDLOW),y) 66 KBUILD_CFLAGS += -mcmodel=medlow 67endif 68ifeq ($(CONFIG_CMODEL_MEDANY),y) 69 KBUILD_CFLAGS += -mcmodel=medany 70endif 71ifeq ($(CONFIG_PERF_EVENTS),y) 72 KBUILD_CFLAGS += -fno-omit-frame-pointer 73endif 74 75KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax) 76 77# GCC versions that support the "-mstrict-align" option default to allowing 78# unaligned accesses. While unaligned accesses are explicitly allowed in the 79# RISC-V ISA, they're emulated by machine mode traps on all extant 80# architectures. It's faster to have GCC emit only aligned accesses. 81KBUILD_CFLAGS += $(call cc-option,-mstrict-align) 82 83ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 84prepare: stack_protector_prepare 85stack_protector_prepare: prepare0 86 $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls \ 87 -mstack-protector-guard-reg=tp \ 88 -mstack-protector-guard-offset=$(shell \ 89 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ 90 include/generated/asm-offsets.h)) 91endif 92 93# arch specific predefines for sparse 94CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS) 95 96# Default target when executing plain make 97boot := arch/riscv/boot 98ifeq ($(CONFIG_XIP_KERNEL),y) 99KBUILD_IMAGE := $(boot)/xipImage 100else 101KBUILD_IMAGE := $(boot)/Image.gz 102endif 103 104head-y := arch/riscv/kernel/head.o 105 106core-$(CONFIG_RISCV_ERRATA_ALTERNATIVE) += arch/riscv/errata/ 107core-$(CONFIG_KVM) += arch/riscv/kvm/ 108 109libs-y += arch/riscv/lib/ 110libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 111 112PHONY += vdso_install 113vdso_install: 114 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@ 115 116ifeq ($(KBUILD_EXTMOD),) 117ifeq ($(CONFIG_MMU),y) 118prepare: vdso_prepare 119vdso_prepare: prepare0 120 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h 121endif 122endif 123 124ifneq ($(CONFIG_XIP_KERNEL),y) 125ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN),yy) 126KBUILD_IMAGE := $(boot)/loader.bin 127else 128KBUILD_IMAGE := $(boot)/Image.gz 129endif 130endif 131BOOT_TARGETS := Image Image.gz loader loader.bin xipImage 132 133all: $(notdir $(KBUILD_IMAGE)) 134 135$(BOOT_TARGETS): vmlinux 136 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 137 @$(kecho) ' Kernel: $(boot)/$@ is ready' 138 139Image.%: Image 140 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 141 142install: install-image = Image 143zinstall: install-image = Image.gz 144install zinstall: 145 $(CONFIG_SHELL) $(srctree)/$(boot)/install.sh $(KERNELRELEASE) \ 146 $(boot)/$(install-image) System.map "$(INSTALL_PATH)" 147 148PHONY += rv32_randconfig 149rv32_randconfig: 150 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \ 151 -f $(srctree)/Makefile randconfig 152 153PHONY += rv64_randconfig 154rv64_randconfig: 155 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \ 156 -f $(srctree)/Makefile randconfig 157