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 ($(CONFIG_ARCH_RV64I),y) 30 BITS := 64 31 UTS_MACHINE := riscv64 32 33 KBUILD_CFLAGS += -mabi=lp64 34 KBUILD_AFLAGS += -mabi=lp64 35 36 KBUILD_LDFLAGS += -melf64lriscv 37else 38 BITS := 32 39 UTS_MACHINE := riscv32 40 41 KBUILD_CFLAGS += -mabi=ilp32 42 KBUILD_AFLAGS += -mabi=ilp32 43 KBUILD_LDFLAGS += -melf32lriscv 44endif 45 46ifndef CONFIG_RISCV_USE_LINKER_RELAXATION 47 KBUILD_CFLAGS += -mno-relax 48 KBUILD_AFLAGS += -mno-relax 49ifndef CONFIG_AS_IS_LLVM 50 KBUILD_CFLAGS += -Wa,-mno-relax 51 KBUILD_AFLAGS += -Wa,-mno-relax 52endif 53# LLVM has an issue with target-features and LTO: https://github.com/llvm/llvm-project/issues/59350 54# Ensure it is aware of linker relaxation with LTO, otherwise relocations may 55# be incorrect: https://github.com/llvm/llvm-project/issues/65090 56else ifeq ($(CONFIG_LTO_CLANG),y) 57 KBUILD_LDFLAGS += -mllvm -mattr=+c -mllvm -mattr=+relax 58endif 59 60ifeq ($(CONFIG_SHADOW_CALL_STACK),y) 61 KBUILD_LDFLAGS += --no-relax-gp 62endif 63 64# ISA string setting 65riscv-march-$(CONFIG_ARCH_RV32I) := rv32ima 66riscv-march-$(CONFIG_ARCH_RV64I) := rv64ima 67riscv-march-$(CONFIG_FPU) := $(riscv-march-y)fd 68riscv-march-$(CONFIG_RISCV_ISA_C) := $(riscv-march-y)c 69riscv-march-$(CONFIG_RISCV_ISA_V) := $(riscv-march-y)v 70 71ifdef CONFIG_TOOLCHAIN_NEEDS_OLD_ISA_SPEC 72KBUILD_CFLAGS += -Wa,-misa-spec=2.2 73KBUILD_AFLAGS += -Wa,-misa-spec=2.2 74else 75riscv-march-$(CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI) := $(riscv-march-y)_zicsr_zifencei 76endif 77 78# Check if the toolchain supports Zihintpause extension 79riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE) := $(riscv-march-y)_zihintpause 80 81# Remove F,D,V from isa string for all. Keep extensions between "fd" and "v" by 82# matching non-v and non-multi-letter extensions out with the filter ([^v_]*) 83KBUILD_CFLAGS += -march=$(shell echo $(riscv-march-y) | sed -E 's/(rv32ima|rv64ima)fd([^v_]*)v?/\1\2/') 84 85KBUILD_AFLAGS += -march=$(riscv-march-y) 86 87KBUILD_CFLAGS += -mno-save-restore 88KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET) 89 90ifeq ($(CONFIG_CMODEL_MEDLOW),y) 91 KBUILD_CFLAGS += -mcmodel=medlow 92endif 93ifeq ($(CONFIG_CMODEL_MEDANY),y) 94 KBUILD_CFLAGS += -mcmodel=medany 95endif 96 97# Avoid generating .eh_frame sections. 98KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 99 100# The RISC-V attributes frequently cause compatibility issues and provide no 101# information, so just turn them off. 102KBUILD_CFLAGS += $(call cc-option,-mno-riscv-attribute) 103KBUILD_AFLAGS += $(call cc-option,-mno-riscv-attribute) 104KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr) 105KBUILD_AFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr) 106 107KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax) 108KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax) 109 110# GCC versions that support the "-mstrict-align" option default to allowing 111# unaligned accesses. While unaligned accesses are explicitly allowed in the 112# RISC-V ISA, they're emulated by machine mode traps on all extant 113# architectures. It's faster to have GCC emit only aligned accesses. 114ifneq ($(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS),y) 115KBUILD_CFLAGS += $(call cc-option,-mstrict-align) 116endif 117 118ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 119prepare: stack_protector_prepare 120stack_protector_prepare: prepare0 121 $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls \ 122 -mstack-protector-guard-reg=tp \ 123 -mstack-protector-guard-offset=$(shell \ 124 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ 125 include/generated/asm-offsets.h)) 126endif 127 128# arch specific predefines for sparse 129CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS) 130 131# Default target when executing plain make 132boot := arch/riscv/boot 133ifeq ($(CONFIG_XIP_KERNEL),y) 134KBUILD_IMAGE := $(boot)/xipImage 135else 136KBUILD_IMAGE := $(boot)/Image.gz 137endif 138 139libs-y += arch/riscv/lib/ 140libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 141 142ifeq ($(KBUILD_EXTMOD),) 143ifeq ($(CONFIG_MMU),y) 144prepare: vdso_prepare 145vdso_prepare: prepare0 146 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h 147 $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \ 148 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h) 149 150endif 151endif 152 153vdso-install-y += arch/riscv/kernel/vdso/vdso.so.dbg 154vdso-install-$(CONFIG_COMPAT) += arch/riscv/kernel/compat_vdso/compat_vdso.so.dbg:../compat_vdso/compat_vdso.so 155 156ifneq ($(CONFIG_XIP_KERNEL),y) 157ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_ARCH_CANAAN),yy) 158KBUILD_IMAGE := $(boot)/loader.bin 159else 160ifeq ($(CONFIG_EFI_ZBOOT),) 161KBUILD_IMAGE := $(boot)/Image.gz 162else 163KBUILD_IMAGE := $(boot)/vmlinuz.efi 164endif 165endif 166endif 167BOOT_TARGETS := Image Image.gz loader loader.bin xipImage vmlinuz.efi 168 169all: $(notdir $(KBUILD_IMAGE)) 170 171loader.bin: loader 172Image.gz loader vmlinuz.efi: Image 173$(BOOT_TARGETS): vmlinux 174 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 175 @$(kecho) ' Kernel: $(boot)/$@ is ready' 176 177Image.%: Image 178 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 179 180install: KBUILD_IMAGE := $(boot)/Image 181zinstall: KBUILD_IMAGE := $(boot)/Image.gz 182install zinstall: 183 $(call cmd,install) 184 185PHONY += rv32_randconfig 186rv32_randconfig: 187 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \ 188 -f $(srctree)/Makefile randconfig 189 190PHONY += rv64_randconfig 191rv64_randconfig: 192 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \ 193 -f $(srctree)/Makefile randconfig 194 195PHONY += rv32_defconfig 196rv32_defconfig: 197 $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config 198 199PHONY += rv32_nommu_virt_defconfig 200rv32_nommu_virt_defconfig: 201 $(Q)$(MAKE) -f $(srctree)/Makefile nommu_virt_defconfig 32-bit.config 202