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 ($(CONFIG_DYNAMIC_FTRACE),y) 14 LDFLAGS_vmlinux := --no-relax 15endif 16KBUILD_AFLAGS_MODULE += -fPIC 17KBUILD_CFLAGS_MODULE += -fPIC 18 19KBUILD_DEFCONFIG = defconfig 20 21export BITS 22ifeq ($(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_CFLAGS += $(call cc-ifversion, -ge, 0500, -DCONFIG_ARCH_SUPPORTS_INT128) 30 31 KBUILD_MARCH = rv64im 32 KBUILD_LDFLAGS += -melf64lriscv 33else 34 BITS := 32 35 UTS_MACHINE := riscv32 36 37 KBUILD_CFLAGS += -mabi=ilp32 38 KBUILD_AFLAGS += -mabi=ilp32 39 KBUILD_MARCH = rv32im 40 KBUILD_LDFLAGS += -melf32lriscv 41endif 42 43KBUILD_CFLAGS += -Wall 44 45ifeq ($(CONFIG_RISCV_ISA_A),y) 46 KBUILD_ARCH_A = a 47endif 48ifeq ($(CONFIG_RISCV_ISA_C),y) 49 KBUILD_ARCH_C = c 50endif 51 52KBUILD_AFLAGS += -march=$(KBUILD_MARCH)$(KBUILD_ARCH_A)fd$(KBUILD_ARCH_C) 53 54KBUILD_CFLAGS += -march=$(KBUILD_MARCH)$(KBUILD_ARCH_A)$(KBUILD_ARCH_C) 55KBUILD_CFLAGS += -mno-save-restore 56KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET) 57 58ifeq ($(CONFIG_CMODEL_MEDLOW),y) 59 KBUILD_CFLAGS += -mcmodel=medlow 60endif 61ifeq ($(CONFIG_CMODEL_MEDANY),y) 62 KBUILD_CFLAGS += -mcmodel=medany 63endif 64ifeq ($(CONFIG_MODULE_SECTIONS),y) 65 KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/riscv/kernel/module.lds 66endif 67 68KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax) 69 70# GCC versions that support the "-mstrict-align" option default to allowing 71# unaligned accesses. While unaligned accesses are explicitly allowed in the 72# RISC-V ISA, they're emulated by machine mode traps on all extant 73# architectures. It's faster to have GCC emit only aligned accesses. 74KBUILD_CFLAGS += $(call cc-option,-mstrict-align) 75 76# arch specific predefines for sparse 77CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS) 78 79head-y := arch/riscv/kernel/head.o 80 81core-y += arch/riscv/kernel/ arch/riscv/mm/ 82 83libs-y += arch/riscv/lib/ 84 85all: vmlinux 86