1# This file is included by the global makefile so that you can add your own 2# architecture-specific flags and dependencies. Remember to do have actions 3# for "archclean" and "archdep" for cleaning up and making dependencies for 4# this architecture 5# 6# This file is subject to the terms and conditions of the GNU General Public 7# License. See the file "COPYING" in the main directory of this archive 8# for more details. 9# 10 11OBJCOPYFLAGS := -O binary 12LDFLAGS_vmlinux := 13ifeq ($(CONFIG_DYNAMIC_FTRACE),y) 14 LDFLAGS_vmlinux := --no-relax 15endif 16KBUILD_AFLAGS_MODULE += -fPIC 17KBUILD_CFLAGS_MODULE += -fPIC 18 19export BITS 20ifeq ($(CONFIG_ARCH_RV64I),y) 21 BITS := 64 22 UTS_MACHINE := riscv64 23 24 KBUILD_CFLAGS += -mabi=lp64 25 KBUILD_AFLAGS += -mabi=lp64 26 27 KBUILD_LDFLAGS += -melf64lriscv 28else 29 BITS := 32 30 UTS_MACHINE := riscv32 31 32 KBUILD_CFLAGS += -mabi=ilp32 33 KBUILD_AFLAGS += -mabi=ilp32 34 KBUILD_LDFLAGS += -melf32lriscv 35endif 36 37ifeq ($(CONFIG_LD_IS_LLD),y) 38ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 150000; echo $$?),0) 39 KBUILD_CFLAGS += -mno-relax 40 KBUILD_AFLAGS += -mno-relax 41ifneq ($(LLVM_IAS),1) 42 KBUILD_CFLAGS += -Wa,-mno-relax 43 KBUILD_AFLAGS += -Wa,-mno-relax 44endif 45endif 46endif 47 48# ISA string setting 49riscv-march-$(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_MODULE_SECTIONS),y) 72 KBUILD_LDS_MODULE += $(srctree)/arch/riscv/kernel/module.lds 73endif 74ifeq ($(CONFIG_PERF_EVENTS),y) 75 KBUILD_CFLAGS += -fno-omit-frame-pointer 76endif 77 78# Avoid generating .eh_frame sections. 79KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 80 81KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax) 82KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax) 83 84# GCC versions that support the "-mstrict-align" option default to allowing 85# unaligned accesses. While unaligned accesses are explicitly allowed in the 86# RISC-V ISA, they're emulated by machine mode traps on all extant 87# architectures. It's faster to have GCC emit only aligned accesses. 88KBUILD_CFLAGS += $(call cc-option,-mstrict-align) 89 90# arch specific predefines for sparse 91CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS) 92 93# Default target when executing plain make 94boot := arch/riscv/boot 95KBUILD_IMAGE := $(boot)/Image.gz 96 97head-y := arch/riscv/kernel/head.o 98 99core-y += arch/riscv/ 100 101libs-y += arch/riscv/lib/ 102 103PHONY += vdso_install 104vdso_install: 105 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@ 106 107all: Image.gz 108 109Image: vmlinux 110 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 111 112Image.%: Image 113 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 114 115zinstall install: 116 $(Q)$(MAKE) $(build)=$(boot) $@ 117