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 := -z norelro 11ifeq ($(CONFIG_RELOCATABLE),y) 12 LDFLAGS_vmlinux += -shared -Bsymbolic -z notext --emit-relocs 13 KBUILD_CFLAGS += -fPIE 14endif 15ifeq ($(CONFIG_DYNAMIC_FTRACE),y) 16 LDFLAGS_vmlinux += --no-relax 17 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 18ifeq ($(CONFIG_RISCV_ISA_C),y) 19 CC_FLAGS_FTRACE := -fpatchable-function-entry=4 20else 21 CC_FLAGS_FTRACE := -fpatchable-function-entry=2 22endif 23endif 24 25ifeq ($(CONFIG_CMODEL_MEDLOW),y) 26KBUILD_CFLAGS_MODULE += -mcmodel=medany 27endif 28 29export BITS 30ifeq ($(CONFIG_ARCH_RV64I),y) 31 BITS := 64 32 UTS_MACHINE := riscv64 33 34 KBUILD_CFLAGS += -mabi=lp64 35 KBUILD_AFLAGS += -mabi=lp64 36 37 KBUILD_LDFLAGS += -melf64lriscv 38else 39 BITS := 32 40 UTS_MACHINE := riscv32 41 42 KBUILD_CFLAGS += -mabi=ilp32 43 KBUILD_AFLAGS += -mabi=ilp32 44 KBUILD_LDFLAGS += -melf32lriscv 45endif 46 47ifeq ($(CONFIG_LD_IS_LLD),y) 48ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 150000),y) 49 KBUILD_CFLAGS += -mno-relax 50 KBUILD_AFLAGS += -mno-relax 51ifndef CONFIG_AS_IS_LLVM 52 KBUILD_CFLAGS += -Wa,-mno-relax 53 KBUILD_AFLAGS += -Wa,-mno-relax 54endif 55endif 56endif 57 58# ISA string setting 59riscv-march-$(CONFIG_ARCH_RV32I) := rv32ima 60riscv-march-$(CONFIG_ARCH_RV64I) := rv64ima 61riscv-march-$(CONFIG_FPU) := $(riscv-march-y)fd 62riscv-march-$(CONFIG_RISCV_ISA_C) := $(riscv-march-y)c 63riscv-march-$(CONFIG_RISCV_ISA_V) := $(riscv-march-y)v 64 65ifdef CONFIG_TOOLCHAIN_NEEDS_OLD_ISA_SPEC 66KBUILD_CFLAGS += -Wa,-misa-spec=2.2 67KBUILD_AFLAGS += -Wa,-misa-spec=2.2 68else 69riscv-march-$(CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI) := $(riscv-march-y)_zicsr_zifencei 70endif 71 72# Check if the toolchain supports Zihintpause extension 73riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE) := $(riscv-march-y)_zihintpause 74 75# Remove F,D,V from isa string for all. Keep extensions between "fd" and "v" by 76# matching non-v and non-multi-letter extensions out with the filter ([^v_]*) 77KBUILD_CFLAGS += -march=$(shell echo $(riscv-march-y) | sed -E 's/(rv32ima|rv64ima)fd([^v_]*)v?/\1\2/') 78 79KBUILD_AFLAGS += -march=$(riscv-march-y) 80 81KBUILD_CFLAGS += -mno-save-restore 82KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET) 83 84ifeq ($(CONFIG_CMODEL_MEDLOW),y) 85 KBUILD_CFLAGS += -mcmodel=medlow 86endif 87ifeq ($(CONFIG_CMODEL_MEDANY),y) 88 KBUILD_CFLAGS += -mcmodel=medany 89endif 90 91# Avoid generating .eh_frame sections. 92KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 93 94# The RISC-V attributes frequently cause compatibility issues and provide no 95# information, so just turn them off. 96KBUILD_CFLAGS += $(call cc-option,-mno-riscv-attribute) 97KBUILD_AFLAGS += $(call cc-option,-mno-riscv-attribute) 98KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr) 99KBUILD_AFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr) 100 101KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax) 102KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax) 103 104# GCC versions that support the "-mstrict-align" option default to allowing 105# unaligned accesses. While unaligned accesses are explicitly allowed in the 106# RISC-V ISA, they're emulated by machine mode traps on all extant 107# architectures. It's faster to have GCC emit only aligned accesses. 108KBUILD_CFLAGS += $(call cc-option,-mstrict-align) 109 110ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 111prepare: stack_protector_prepare 112stack_protector_prepare: prepare0 113 $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls \ 114 -mstack-protector-guard-reg=tp \ 115 -mstack-protector-guard-offset=$(shell \ 116 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ 117 include/generated/asm-offsets.h)) 118endif 119 120# arch specific predefines for sparse 121CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS) 122 123# Default target when executing plain make 124boot := arch/riscv/boot 125ifeq ($(CONFIG_XIP_KERNEL),y) 126KBUILD_IMAGE := $(boot)/xipImage 127else 128KBUILD_IMAGE := $(boot)/Image.gz 129endif 130 131libs-y += arch/riscv/lib/ 132libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 133 134ifeq ($(KBUILD_EXTMOD),) 135ifeq ($(CONFIG_MMU),y) 136prepare: vdso_prepare 137vdso_prepare: prepare0 138 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h 139 $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \ 140 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h) 141 142endif 143endif 144 145vdso-install-y += arch/riscv/kernel/vdso/vdso.so.dbg 146vdso-install-$(CONFIG_COMPAT) += arch/riscv/kernel/compat_vdso/compat_vdso.so.dbg:../compat_vdso/compat_vdso.so 147 148ifneq ($(CONFIG_XIP_KERNEL),y) 149ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_ARCH_CANAAN),yy) 150KBUILD_IMAGE := $(boot)/loader.bin 151else 152ifeq ($(CONFIG_EFI_ZBOOT),) 153KBUILD_IMAGE := $(boot)/Image.gz 154else 155KBUILD_IMAGE := $(boot)/vmlinuz.efi 156endif 157endif 158endif 159BOOT_TARGETS := Image Image.gz loader loader.bin xipImage vmlinuz.efi 160 161all: $(notdir $(KBUILD_IMAGE)) 162 163$(BOOT_TARGETS): vmlinux 164 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 165 @$(kecho) ' Kernel: $(boot)/$@ is ready' 166 167Image.%: Image 168 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 169 170install: KBUILD_IMAGE := $(boot)/Image 171zinstall: KBUILD_IMAGE := $(boot)/Image.gz 172install zinstall: 173 $(call cmd,install) 174 175PHONY += rv32_randconfig 176rv32_randconfig: 177 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \ 178 -f $(srctree)/Makefile randconfig 179 180PHONY += rv64_randconfig 181rv64_randconfig: 182 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \ 183 -f $(srctree)/Makefile randconfig 184 185PHONY += rv32_defconfig 186rv32_defconfig: 187 $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config 188 189PHONY += rv32_nommu_virt_defconfig 190rv32_nommu_virt_defconfig: 191 $(Q)$(MAKE) -f $(srctree)/Makefile nommu_virt_defconfig 32-bit.config 192