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 9LDFLAGS_vmlinux := -z norelro 10ifeq ($(CONFIG_RELOCATABLE),y) 11 LDFLAGS_vmlinux += -shared -Bsymbolic -z notext --emit-relocs 12 KBUILD_CFLAGS += -fPIE 13endif 14ifeq ($(CONFIG_DYNAMIC_FTRACE),y) 15 LDFLAGS_vmlinux += --no-relax 16 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 17ifeq ($(CONFIG_RISCV_ISA_C),y) 18 CC_FLAGS_FTRACE := -fpatchable-function-entry=4 19else 20 CC_FLAGS_FTRACE := -fpatchable-function-entry=2 21endif 22endif 23 24ifeq ($(CONFIG_CMODEL_MEDLOW),y) 25KBUILD_CFLAGS_MODULE += -mcmodel=medany 26endif 27 28export BITS 29ifeq ($(CONFIG_ARCH_RV64I),y) 30 BITS := 64 31 UTS_MACHINE := riscv64 32 33 KBUILD_CFLAGS += -mabi=lp64 34 KBUILD_AFLAGS += -mabi=lp64 35 36 KBUILD_LDFLAGS += -melf64lriscv 37else 38 BITS := 32 39 UTS_MACHINE := riscv32 40 41 KBUILD_CFLAGS += -mabi=ilp32 42 KBUILD_AFLAGS += -mabi=ilp32 43 KBUILD_LDFLAGS += -melf32lriscv 44endif 45 46ifndef CONFIG_RISCV_USE_LINKER_RELAXATION 47 KBUILD_CFLAGS += -mno-relax 48 KBUILD_AFLAGS += -mno-relax 49ifndef CONFIG_AS_IS_LLVM 50 KBUILD_CFLAGS += -Wa,-mno-relax 51 KBUILD_AFLAGS += -Wa,-mno-relax 52endif 53endif 54 55ifeq ($(CONFIG_SHADOW_CALL_STACK),y) 56 KBUILD_LDFLAGS += --no-relax-gp 57endif 58 59# ISA string setting 60riscv-march-$(CONFIG_ARCH_RV32I) := rv32ima 61riscv-march-$(CONFIG_ARCH_RV64I) := rv64ima 62riscv-march-$(CONFIG_FPU) := $(riscv-march-y)fd 63riscv-march-$(CONFIG_RISCV_ISA_C) := $(riscv-march-y)c 64riscv-march-$(CONFIG_RISCV_ISA_V) := $(riscv-march-y)v 65 66ifdef CONFIG_TOOLCHAIN_NEEDS_OLD_ISA_SPEC 67KBUILD_CFLAGS += -Wa,-misa-spec=2.2 68KBUILD_AFLAGS += -Wa,-misa-spec=2.2 69else 70riscv-march-$(CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI) := $(riscv-march-y)_zicsr_zifencei 71endif 72 73# Check if the toolchain supports Zihintpause extension 74riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE) := $(riscv-march-y)_zihintpause 75 76# Remove F,D,V from isa string for all. Keep extensions between "fd" and "v" by 77# matching non-v and non-multi-letter extensions out with the filter ([^v_]*) 78KBUILD_CFLAGS += -march=$(shell echo $(riscv-march-y) | sed -E 's/(rv32ima|rv64ima)fd([^v_]*)v?/\1\2/') 79 80KBUILD_AFLAGS += -march=$(riscv-march-y) 81 82KBUILD_CFLAGS += -mno-save-restore 83KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET) 84 85ifeq ($(CONFIG_CMODEL_MEDLOW),y) 86 KBUILD_CFLAGS += -mcmodel=medlow 87endif 88ifeq ($(CONFIG_CMODEL_MEDANY),y) 89 KBUILD_CFLAGS += -mcmodel=medany 90endif 91 92# Avoid generating .eh_frame sections. 93KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 94 95# The RISC-V attributes frequently cause compatibility issues and provide no 96# information, so just turn them off. 97KBUILD_CFLAGS += $(call cc-option,-mno-riscv-attribute) 98KBUILD_AFLAGS += $(call cc-option,-mno-riscv-attribute) 99KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr) 100KBUILD_AFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr) 101 102KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax) 103KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax) 104 105# GCC versions that support the "-mstrict-align" option default to allowing 106# unaligned accesses. While unaligned accesses are explicitly allowed in the 107# RISC-V ISA, they're emulated by machine mode traps on all extant 108# architectures. It's faster to have GCC emit only aligned accesses. 109ifneq ($(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS),y) 110KBUILD_CFLAGS += $(call cc-option,-mstrict-align) 111endif 112 113ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 114prepare: stack_protector_prepare 115stack_protector_prepare: prepare0 116 $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls \ 117 -mstack-protector-guard-reg=tp \ 118 -mstack-protector-guard-offset=$(shell \ 119 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ 120 include/generated/asm-offsets.h)) 121endif 122 123# arch specific predefines for sparse 124CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS) 125 126# Default target when executing plain make 127boot := arch/riscv/boot 128ifeq ($(CONFIG_XIP_KERNEL),y) 129KBUILD_IMAGE := $(boot)/xipImage 130else 131KBUILD_IMAGE := $(boot)/Image.gz 132endif 133 134libs-y += arch/riscv/lib/ 135libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 136 137ifeq ($(KBUILD_EXTMOD),) 138ifeq ($(CONFIG_MMU),y) 139prepare: vdso_prepare 140vdso_prepare: prepare0 141 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h 142 $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \ 143 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h) 144 145endif 146endif 147 148vdso-install-y += arch/riscv/kernel/vdso/vdso.so.dbg 149vdso-install-$(CONFIG_COMPAT) += arch/riscv/kernel/compat_vdso/compat_vdso.so.dbg:../compat_vdso/compat_vdso.so 150 151ifneq ($(CONFIG_XIP_KERNEL),y) 152ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_ARCH_CANAAN),yy) 153KBUILD_IMAGE := $(boot)/loader.bin 154else 155ifeq ($(CONFIG_EFI_ZBOOT),) 156KBUILD_IMAGE := $(boot)/Image.gz 157else 158KBUILD_IMAGE := $(boot)/vmlinuz.efi 159endif 160endif 161endif 162BOOT_TARGETS := Image Image.gz loader loader.bin xipImage vmlinuz.efi 163 164all: $(notdir $(KBUILD_IMAGE)) 165 166loader.bin: loader 167Image.gz loader vmlinuz.efi: Image 168$(BOOT_TARGETS): vmlinux 169 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 170 @$(kecho) ' Kernel: $(boot)/$@ is ready' 171 172Image.%: Image 173 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 174 175install: KBUILD_IMAGE := $(boot)/Image 176zinstall: KBUILD_IMAGE := $(boot)/Image.gz 177install zinstall: 178 $(call cmd,install) 179 180PHONY += rv32_randconfig 181rv32_randconfig: 182 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \ 183 -f $(srctree)/Makefile randconfig 184 185PHONY += rv64_randconfig 186rv64_randconfig: 187 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \ 188 -f $(srctree)/Makefile randconfig 189 190PHONY += rv32_defconfig 191rv32_defconfig: 192 $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config 193 194PHONY += rv32_nommu_virt_defconfig 195rv32_nommu_virt_defconfig: 196 $(Q)$(MAKE) -f $(srctree)/Makefile nommu_virt_defconfig 32-bit.config 197