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 10ifeq ($(CONFIG_RELOCATABLE),y) 11 LDFLAGS_vmlinux += -shared -Bsymbolic -z notext -z norelro --emit-relocs 12 KBUILD_CFLAGS += -fPIE 13endif 14ifeq ($(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 ($(CONFIG_ARCH_RV64I),y) 30 BITS := 64 31 UTS_MACHINE := riscv64 32 33 KBUILD_CFLAGS += -mabi=lp64 34 KBUILD_AFLAGS += -mabi=lp64 35 36 KBUILD_LDFLAGS += -melf64lriscv 37else 38 BITS := 32 39 UTS_MACHINE := riscv32 40 41 KBUILD_CFLAGS += -mabi=ilp32 42 KBUILD_AFLAGS += -mabi=ilp32 43 KBUILD_LDFLAGS += -melf32lriscv 44endif 45 46ifeq ($(CONFIG_LD_IS_LLD),y) 47ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 150000),y) 48 KBUILD_CFLAGS += -mno-relax 49 KBUILD_AFLAGS += -mno-relax 50ifndef CONFIG_AS_IS_LLVM 51 KBUILD_CFLAGS += -Wa,-mno-relax 52 KBUILD_AFLAGS += -Wa,-mno-relax 53endif 54endif 55endif 56 57# ISA string setting 58riscv-march-$(CONFIG_ARCH_RV32I) := rv32ima 59riscv-march-$(CONFIG_ARCH_RV64I) := rv64ima 60riscv-march-$(CONFIG_FPU) := $(riscv-march-y)fd 61riscv-march-$(CONFIG_RISCV_ISA_C) := $(riscv-march-y)c 62 63# Newer binutils versions default to ISA spec version 20191213 which moves some 64# instructions from the I extension to the Zicsr and Zifencei extensions. 65toolchain-need-zicsr-zifencei := $(call cc-option-yn, -march=$(riscv-march-y)_zicsr_zifencei) 66riscv-march-$(toolchain-need-zicsr-zifencei) := $(riscv-march-y)_zicsr_zifencei 67 68# Check if the toolchain supports Zihintpause extension 69riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE) := $(riscv-march-y)_zihintpause 70 71KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y)) 72KBUILD_AFLAGS += -march=$(riscv-march-y) 73 74KBUILD_CFLAGS += -mno-save-restore 75KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET) 76 77ifeq ($(CONFIG_CMODEL_MEDLOW),y) 78 KBUILD_CFLAGS += -mcmodel=medlow 79endif 80ifeq ($(CONFIG_CMODEL_MEDANY),y) 81 KBUILD_CFLAGS += -mcmodel=medany 82endif 83ifeq ($(CONFIG_PERF_EVENTS),y) 84 KBUILD_CFLAGS += -fno-omit-frame-pointer 85endif 86 87# Avoid generating .eh_frame sections. 88KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 89 90KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax) 91KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax) 92 93# GCC versions that support the "-mstrict-align" option default to allowing 94# unaligned accesses. While unaligned accesses are explicitly allowed in the 95# RISC-V ISA, they're emulated by machine mode traps on all extant 96# architectures. It's faster to have GCC emit only aligned accesses. 97KBUILD_CFLAGS += $(call cc-option,-mstrict-align) 98 99ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 100prepare: stack_protector_prepare 101stack_protector_prepare: prepare0 102 $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls \ 103 -mstack-protector-guard-reg=tp \ 104 -mstack-protector-guard-offset=$(shell \ 105 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ 106 include/generated/asm-offsets.h)) 107endif 108 109# arch specific predefines for sparse 110CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS) 111 112# Default target when executing plain make 113boot := arch/riscv/boot 114ifeq ($(CONFIG_XIP_KERNEL),y) 115KBUILD_IMAGE := $(boot)/xipImage 116else 117KBUILD_IMAGE := $(boot)/Image.gz 118endif 119 120libs-y += arch/riscv/lib/ 121libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 122 123PHONY += vdso_install 124vdso_install: 125 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@ 126 $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \ 127 $(build)=arch/riscv/kernel/compat_vdso compat_$@) 128 129ifeq ($(KBUILD_EXTMOD),) 130ifeq ($(CONFIG_MMU),y) 131prepare: vdso_prepare 132vdso_prepare: prepare0 133 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h 134 $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \ 135 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h) 136 137endif 138endif 139 140ifneq ($(CONFIG_XIP_KERNEL),y) 141ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_ARCH_CANAAN),yy) 142KBUILD_IMAGE := $(boot)/loader.bin 143else 144ifeq ($(CONFIG_EFI_ZBOOT),) 145KBUILD_IMAGE := $(boot)/Image.gz 146else 147KBUILD_IMAGE := $(boot)/vmlinuz.efi 148endif 149endif 150endif 151BOOT_TARGETS := Image Image.gz loader loader.bin xipImage vmlinuz.efi 152 153all: $(notdir $(KBUILD_IMAGE)) 154 155$(BOOT_TARGETS): vmlinux 156 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 157 @$(kecho) ' Kernel: $(boot)/$@ is ready' 158 159Image.%: Image 160 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 161 162install: KBUILD_IMAGE := $(boot)/Image 163zinstall: KBUILD_IMAGE := $(boot)/Image.gz 164install zinstall: 165 $(call cmd,install) 166 167PHONY += rv32_randconfig 168rv32_randconfig: 169 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \ 170 -f $(srctree)/Makefile randconfig 171 172PHONY += rv64_randconfig 173rv64_randconfig: 174 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \ 175 -f $(srctree)/Makefile randconfig 176 177PHONY += rv32_defconfig 178rv32_defconfig: 179 $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config 180