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) := $(riscv-march-y)c 63 64ifdef CONFIG_TOOLCHAIN_NEEDS_OLD_ISA_SPEC 65KBUILD_CFLAGS += -Wa,-misa-spec=2.2 66KBUILD_AFLAGS += -Wa,-misa-spec=2.2 67else 68riscv-march-$(CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI) := $(riscv-march-y)_zicsr_zifencei 69endif 70 71# Check if the toolchain supports Zihintpause extension 72riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE) := $(riscv-march-y)_zihintpause 73 74KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y)) 75KBUILD_AFLAGS += -march=$(riscv-march-y) 76 77KBUILD_CFLAGS += -mno-save-restore 78KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET) 79 80ifeq ($(CONFIG_CMODEL_MEDLOW),y) 81 KBUILD_CFLAGS += -mcmodel=medlow 82endif 83ifeq ($(CONFIG_CMODEL_MEDANY),y) 84 KBUILD_CFLAGS += -mcmodel=medany 85endif 86ifeq ($(CONFIG_PERF_EVENTS),y) 87 KBUILD_CFLAGS += -fno-omit-frame-pointer 88endif 89 90# Avoid generating .eh_frame sections. 91KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 92 93# The RISC-V attributes frequently cause compatibility issues and provide no 94# information, so just turn them off. 95KBUILD_CFLAGS += $(call cc-option,-mno-riscv-attribute) 96KBUILD_AFLAGS += $(call cc-option,-mno-riscv-attribute) 97KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr) 98KBUILD_AFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr) 99 100KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax) 101KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax) 102 103# GCC versions that support the "-mstrict-align" option default to allowing 104# unaligned accesses. While unaligned accesses are explicitly allowed in the 105# RISC-V ISA, they're emulated by machine mode traps on all extant 106# architectures. It's faster to have GCC emit only aligned accesses. 107KBUILD_CFLAGS += $(call cc-option,-mstrict-align) 108 109ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 110prepare: stack_protector_prepare 111stack_protector_prepare: prepare0 112 $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls \ 113 -mstack-protector-guard-reg=tp \ 114 -mstack-protector-guard-offset=$(shell \ 115 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ 116 include/generated/asm-offsets.h)) 117endif 118 119# arch specific predefines for sparse 120CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS) 121 122# Default target when executing plain make 123boot := arch/riscv/boot 124ifeq ($(CONFIG_XIP_KERNEL),y) 125KBUILD_IMAGE := $(boot)/xipImage 126else 127KBUILD_IMAGE := $(boot)/Image.gz 128endif 129 130libs-y += arch/riscv/lib/ 131libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 132 133PHONY += vdso_install 134vdso_install: 135 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@ 136 $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \ 137 $(build)=arch/riscv/kernel/compat_vdso compat_$@) 138 139ifeq ($(KBUILD_EXTMOD),) 140ifeq ($(CONFIG_MMU),y) 141prepare: vdso_prepare 142vdso_prepare: prepare0 143 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h 144 $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \ 145 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h) 146 147endif 148endif 149 150ifneq ($(CONFIG_XIP_KERNEL),y) 151ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_ARCH_CANAAN),yy) 152KBUILD_IMAGE := $(boot)/loader.bin 153else 154ifeq ($(CONFIG_EFI_ZBOOT),) 155KBUILD_IMAGE := $(boot)/Image.gz 156else 157KBUILD_IMAGE := $(boot)/vmlinuz.efi 158endif 159endif 160endif 161BOOT_TARGETS := Image Image.gz loader loader.bin xipImage vmlinuz.efi 162 163all: $(notdir $(KBUILD_IMAGE)) 164 165$(BOOT_TARGETS): vmlinux 166 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 167 @$(kecho) ' Kernel: $(boot)/$@ is ready' 168 169Image.%: Image 170 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 171 172install: KBUILD_IMAGE := $(boot)/Image 173zinstall: KBUILD_IMAGE := $(boot)/Image.gz 174install zinstall: 175 $(call cmd,install) 176 177PHONY += rv32_randconfig 178rv32_randconfig: 179 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \ 180 -f $(srctree)/Makefile randconfig 181 182PHONY += rv64_randconfig 183rv64_randconfig: 184 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \ 185 -f $(srctree)/Makefile randconfig 186 187PHONY += rv32_defconfig 188rv32_defconfig: 189 $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config 190 191PHONY += rv32_nommu_virt_defconfig 192rv32_nommu_virt_defconfig: 193 $(Q)$(MAKE) -f $(srctree)/Makefile nommu_virt_defconfig 32-bit.config 194