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) := $(riscv-march-y)c 59 60ifdef CONFIG_TOOLCHAIN_NEEDS_OLD_ISA_SPEC 61KBUILD_CFLAGS += -Wa,-misa-spec=2.2 62KBUILD_AFLAGS += -Wa,-misa-spec=2.2 63else 64riscv-march-$(CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI) := $(riscv-march-y)_zicsr_zifencei 65endif 66 67# Check if the toolchain supports Zihintpause extension 68riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE) := $(riscv-march-y)_zihintpause 69 70KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y)) 71KBUILD_AFLAGS += -march=$(riscv-march-y) 72 73KBUILD_CFLAGS += -mno-save-restore 74KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET) 75 76ifeq ($(CONFIG_CMODEL_MEDLOW),y) 77 KBUILD_CFLAGS += -mcmodel=medlow 78endif 79ifeq ($(CONFIG_CMODEL_MEDANY),y) 80 KBUILD_CFLAGS += -mcmodel=medany 81endif 82ifeq ($(CONFIG_PERF_EVENTS),y) 83 KBUILD_CFLAGS += -fno-omit-frame-pointer 84endif 85 86# Avoid generating .eh_frame sections. 87KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 88 89# The RISC-V attributes frequently cause compatibility issues and provide no 90# information, so just turn them off. 91KBUILD_CFLAGS += $(call cc-option,-mno-riscv-attribute) 92KBUILD_AFLAGS += $(call cc-option,-mno-riscv-attribute) 93KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr) 94KBUILD_AFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr) 95 96KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax) 97KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax) 98 99# GCC versions that support the "-mstrict-align" option default to allowing 100# unaligned accesses. While unaligned accesses are explicitly allowed in the 101# RISC-V ISA, they're emulated by machine mode traps on all extant 102# architectures. It's faster to have GCC emit only aligned accesses. 103KBUILD_CFLAGS += $(call cc-option,-mstrict-align) 104 105ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 106prepare: stack_protector_prepare 107stack_protector_prepare: prepare0 108 $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls \ 109 -mstack-protector-guard-reg=tp \ 110 -mstack-protector-guard-offset=$(shell \ 111 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ 112 include/generated/asm-offsets.h)) 113endif 114 115# arch specific predefines for sparse 116CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS) 117 118# Default target when executing plain make 119boot := arch/riscv/boot 120ifeq ($(CONFIG_XIP_KERNEL),y) 121KBUILD_IMAGE := $(boot)/xipImage 122else 123KBUILD_IMAGE := $(boot)/Image.gz 124endif 125 126libs-y += arch/riscv/lib/ 127libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 128 129PHONY += vdso_install 130vdso_install: 131 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@ 132 $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \ 133 $(build)=arch/riscv/kernel/compat_vdso compat_$@) 134 135ifeq ($(KBUILD_EXTMOD),) 136ifeq ($(CONFIG_MMU),y) 137prepare: vdso_prepare 138vdso_prepare: prepare0 139 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h 140 $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \ 141 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h) 142 143endif 144endif 145 146ifneq ($(CONFIG_XIP_KERNEL),y) 147ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_ARCH_CANAAN),yy) 148KBUILD_IMAGE := $(boot)/loader.bin 149else 150ifeq ($(CONFIG_EFI_ZBOOT),) 151KBUILD_IMAGE := $(boot)/Image.gz 152else 153KBUILD_IMAGE := $(boot)/vmlinuz.efi 154endif 155endif 156endif 157BOOT_TARGETS := Image Image.gz loader loader.bin xipImage vmlinuz.efi 158 159all: $(notdir $(KBUILD_IMAGE)) 160 161$(BOOT_TARGETS): vmlinux 162 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 163 @$(kecho) ' Kernel: $(boot)/$@ is ready' 164 165Image.%: Image 166 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 167 168install: KBUILD_IMAGE := $(boot)/Image 169zinstall: KBUILD_IMAGE := $(boot)/Image.gz 170install zinstall: 171 $(call cmd,install) 172 173PHONY += rv32_randconfig 174rv32_randconfig: 175 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \ 176 -f $(srctree)/Makefile randconfig 177 178PHONY += rv64_randconfig 179rv64_randconfig: 180 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \ 181 -f $(srctree)/Makefile randconfig 182 183PHONY += rv32_defconfig 184rv32_defconfig: 185 $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config 186