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 ($(CONFIG_DYNAMIC_FTRACE),y) 12 LDFLAGS_vmlinux := --no-relax 13 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 14ifeq ($(CONFIG_RISCV_ISA_C),y) 15 CC_FLAGS_FTRACE := -fpatchable-function-entry=4 16else 17 CC_FLAGS_FTRACE := -fpatchable-function-entry=2 18endif 19endif 20 21ifeq ($(CONFIG_CMODEL_MEDLOW),y) 22KBUILD_CFLAGS_MODULE += -mcmodel=medany 23endif 24 25export BITS 26ifeq ($(CONFIG_ARCH_RV64I),y) 27 BITS := 64 28 UTS_MACHINE := riscv64 29 30 KBUILD_CFLAGS += -mabi=lp64 31 KBUILD_AFLAGS += -mabi=lp64 32 33 KBUILD_LDFLAGS += -melf64lriscv 34else 35 BITS := 32 36 UTS_MACHINE := riscv32 37 38 KBUILD_CFLAGS += -mabi=ilp32 39 KBUILD_AFLAGS += -mabi=ilp32 40 KBUILD_LDFLAGS += -melf32lriscv 41endif 42 43ifeq ($(CONFIG_LD_IS_LLD),y) 44ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 150000),y) 45 KBUILD_CFLAGS += -mno-relax 46 KBUILD_AFLAGS += -mno-relax 47ifndef CONFIG_AS_IS_LLVM 48 KBUILD_CFLAGS += -Wa,-mno-relax 49 KBUILD_AFLAGS += -Wa,-mno-relax 50endif 51endif 52endif 53 54# ISA string setting 55riscv-march-$(CONFIG_ARCH_RV32I) := rv32ima 56riscv-march-$(CONFIG_ARCH_RV64I) := rv64ima 57riscv-march-$(CONFIG_FPU) := $(riscv-march-y)fd 58riscv-march-$(CONFIG_RISCV_ISA_C) := $(riscv-march-y)c 59 60# Newer binutils versions default to ISA spec version 20191213 which moves some 61# instructions from the I extension to the Zicsr and Zifencei extensions. 62toolchain-need-zicsr-zifencei := $(call cc-option-yn, -march=$(riscv-march-y)_zicsr_zifencei) 63riscv-march-$(toolchain-need-zicsr-zifencei) := $(riscv-march-y)_zicsr_zifencei 64 65# Check if the toolchain supports Zihintpause extension 66riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE) := $(riscv-march-y)_zihintpause 67 68KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y)) 69KBUILD_AFLAGS += -march=$(riscv-march-y) 70 71KBUILD_CFLAGS += -mno-save-restore 72KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET) 73 74ifeq ($(CONFIG_CMODEL_MEDLOW),y) 75 KBUILD_CFLAGS += -mcmodel=medlow 76endif 77ifeq ($(CONFIG_CMODEL_MEDANY),y) 78 KBUILD_CFLAGS += -mcmodel=medany 79endif 80ifeq ($(CONFIG_PERF_EVENTS),y) 81 KBUILD_CFLAGS += -fno-omit-frame-pointer 82endif 83 84# Avoid generating .eh_frame sections. 85KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 86 87# The RISC-V attributes frequently cause compatibility issues and provide no 88# information, so just turn them off. 89KBUILD_CFLAGS += $(call cc-option,-mno-riscv-attribute) 90KBUILD_AFLAGS += $(call cc-option,-mno-riscv-attribute) 91KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr) 92KBUILD_AFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr) 93 94KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax) 95KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax) 96 97# GCC versions that support the "-mstrict-align" option default to allowing 98# unaligned accesses. While unaligned accesses are explicitly allowed in the 99# RISC-V ISA, they're emulated by machine mode traps on all extant 100# architectures. It's faster to have GCC emit only aligned accesses. 101KBUILD_CFLAGS += $(call cc-option,-mstrict-align) 102 103ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 104prepare: stack_protector_prepare 105stack_protector_prepare: prepare0 106 $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls \ 107 -mstack-protector-guard-reg=tp \ 108 -mstack-protector-guard-offset=$(shell \ 109 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ 110 include/generated/asm-offsets.h)) 111endif 112 113# arch specific predefines for sparse 114CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS) 115 116# Default target when executing plain make 117boot := arch/riscv/boot 118ifeq ($(CONFIG_XIP_KERNEL),y) 119KBUILD_IMAGE := $(boot)/xipImage 120else 121KBUILD_IMAGE := $(boot)/Image.gz 122endif 123 124libs-y += arch/riscv/lib/ 125libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 126 127PHONY += vdso_install 128vdso_install: 129 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@ 130 $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \ 131 $(build)=arch/riscv/kernel/compat_vdso compat_$@) 132 133ifeq ($(KBUILD_EXTMOD),) 134ifeq ($(CONFIG_MMU),y) 135prepare: vdso_prepare 136vdso_prepare: prepare0 137 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h 138 $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \ 139 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h) 140 141endif 142endif 143 144ifneq ($(CONFIG_XIP_KERNEL),y) 145ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_ARCH_CANAAN),yy) 146KBUILD_IMAGE := $(boot)/loader.bin 147else 148ifeq ($(CONFIG_EFI_ZBOOT),) 149KBUILD_IMAGE := $(boot)/Image.gz 150else 151KBUILD_IMAGE := $(boot)/vmlinuz.efi 152endif 153endif 154endif 155BOOT_TARGETS := Image Image.gz loader loader.bin xipImage vmlinuz.efi 156 157all: $(notdir $(KBUILD_IMAGE)) 158 159$(BOOT_TARGETS): vmlinux 160 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 161 @$(kecho) ' Kernel: $(boot)/$@ is ready' 162 163Image.%: Image 164 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 165 166install: KBUILD_IMAGE := $(boot)/Image 167zinstall: KBUILD_IMAGE := $(boot)/Image.gz 168install zinstall: 169 $(call cmd,install) 170 171PHONY += rv32_randconfig 172rv32_randconfig: 173 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \ 174 -f $(srctree)/Makefile randconfig 175 176PHONY += rv64_randconfig 177rv64_randconfig: 178 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \ 179 -f $(srctree)/Makefile randconfig 180 181PHONY += rv32_defconfig 182rv32_defconfig: 183 $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config 184