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) 76KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax) 77 78# GCC versions that support the "-mstrict-align" option default to allowing 79# unaligned accesses. While unaligned accesses are explicitly allowed in the 80# RISC-V ISA, they're emulated by machine mode traps on all extant 81# architectures. It's faster to have GCC emit only aligned accesses. 82KBUILD_CFLAGS += $(call cc-option,-mstrict-align) 83 84ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 85prepare: stack_protector_prepare 86stack_protector_prepare: prepare0 87 $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls \ 88 -mstack-protector-guard-reg=tp \ 89 -mstack-protector-guard-offset=$(shell \ 90 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ 91 include/generated/asm-offsets.h)) 92endif 93 94# arch specific predefines for sparse 95CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS) 96 97# Default target when executing plain make 98boot := arch/riscv/boot 99ifeq ($(CONFIG_XIP_KERNEL),y) 100KBUILD_IMAGE := $(boot)/xipImage 101else 102KBUILD_IMAGE := $(boot)/Image.gz 103endif 104 105head-y := arch/riscv/kernel/head.o 106 107libs-y += arch/riscv/lib/ 108libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 109 110PHONY += vdso_install 111vdso_install: 112 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@ 113 $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \ 114 $(build)=arch/riscv/kernel/compat_vdso compat_$@) 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 121 $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \ 122 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h) 123 124endif 125endif 126 127ifneq ($(CONFIG_XIP_KERNEL),y) 128ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN),yy) 129KBUILD_IMAGE := $(boot)/loader.bin 130else 131KBUILD_IMAGE := $(boot)/Image.gz 132endif 133endif 134BOOT_TARGETS := Image Image.gz loader loader.bin xipImage 135 136all: $(notdir $(KBUILD_IMAGE)) 137 138$(BOOT_TARGETS): vmlinux 139 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 140 @$(kecho) ' Kernel: $(boot)/$@ is ready' 141 142Image.%: Image 143 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 144 145install: KBUILD_IMAGE := $(boot)/Image 146zinstall: KBUILD_IMAGE := $(boot)/Image.gz 147install zinstall: 148 $(call cmd,install) 149 150PHONY += rv32_randconfig 151rv32_randconfig: 152 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \ 153 -f $(srctree)/Makefile randconfig 154 155PHONY += rv64_randconfig 156rv64_randconfig: 157 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \ 158 -f $(srctree)/Makefile randconfig 159 160PHONY += rv32_defconfig 161rv32_defconfig: 162 $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config 163