1# This file is included by the global makefile so that you can add your own 2# architecture-specific flags and dependencies. Remember to do have actions 3# for "archclean" and "archdep" for cleaning up and making dependencies for 4# this architecture 5# 6# This file is subject to the terms and conditions of the GNU General Public 7# License. See the file "COPYING" in the main directory of this archive 8# for more details. 9# 10 11OBJCOPYFLAGS := -O binary 12LDFLAGS_vmlinux := 13ifeq ($(CONFIG_DYNAMIC_FTRACE),y) 14 LDFLAGS_vmlinux := --no-relax 15 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 16 CC_FLAGS_FTRACE := -fpatchable-function-entry=8 17endif 18 19ifeq ($(CONFIG_CMODEL_MEDLOW),y) 20KBUILD_CFLAGS_MODULE += -mcmodel=medany 21endif 22 23export BITS 24ifeq ($(CONFIG_ARCH_RV64I),y) 25 BITS := 64 26 UTS_MACHINE := riscv64 27 28 KBUILD_CFLAGS += -mabi=lp64 29 KBUILD_AFLAGS += -mabi=lp64 30 31 KBUILD_LDFLAGS += -melf64lriscv 32else 33 BITS := 32 34 UTS_MACHINE := riscv32 35 36 KBUILD_CFLAGS += -mabi=ilp32 37 KBUILD_AFLAGS += -mabi=ilp32 38 KBUILD_LDFLAGS += -melf32lriscv 39endif 40 41ifeq ($(CONFIG_LD_IS_LLD),y) 42 KBUILD_CFLAGS += -mno-relax 43 KBUILD_AFLAGS += -mno-relax 44ifneq ($(LLVM_IAS),1) 45 KBUILD_CFLAGS += -Wa,-mno-relax 46 KBUILD_AFLAGS += -Wa,-mno-relax 47endif 48endif 49 50# ISA string setting 51riscv-march-$(CONFIG_ARCH_RV32I) := rv32ima 52riscv-march-$(CONFIG_ARCH_RV64I) := rv64ima 53riscv-march-$(CONFIG_FPU) := $(riscv-march-y)fd 54riscv-march-$(CONFIG_RISCV_ISA_C) := $(riscv-march-y)c 55KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y)) 56KBUILD_AFLAGS += -march=$(riscv-march-y) 57 58KBUILD_CFLAGS += -mno-save-restore 59KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET) 60 61ifeq ($(CONFIG_CMODEL_MEDLOW),y) 62 KBUILD_CFLAGS += -mcmodel=medlow 63endif 64ifeq ($(CONFIG_CMODEL_MEDANY),y) 65 KBUILD_CFLAGS += -mcmodel=medany 66endif 67ifeq ($(CONFIG_PERF_EVENTS),y) 68 KBUILD_CFLAGS += -fno-omit-frame-pointer 69endif 70 71KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax) 72 73# GCC versions that support the "-mstrict-align" option default to allowing 74# unaligned accesses. While unaligned accesses are explicitly allowed in the 75# RISC-V ISA, they're emulated by machine mode traps on all extant 76# architectures. It's faster to have GCC emit only aligned accesses. 77KBUILD_CFLAGS += $(call cc-option,-mstrict-align) 78 79ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 80prepare: stack_protector_prepare 81stack_protector_prepare: prepare0 82 $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls \ 83 -mstack-protector-guard-reg=tp \ 84 -mstack-protector-guard-offset=$(shell \ 85 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ 86 include/generated/asm-offsets.h)) 87endif 88 89# arch specific predefines for sparse 90CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS) 91 92# Default target when executing plain make 93boot := arch/riscv/boot 94ifeq ($(CONFIG_XIP_KERNEL),y) 95KBUILD_IMAGE := $(boot)/xipImage 96else 97KBUILD_IMAGE := $(boot)/Image.gz 98endif 99 100head-y := arch/riscv/kernel/head.o 101 102core-$(CONFIG_RISCV_ERRATA_ALTERNATIVE) += arch/riscv/errata/ 103 104libs-y += arch/riscv/lib/ 105libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 106 107PHONY += vdso_install 108vdso_install: 109 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@ 110 111ifneq ($(CONFIG_XIP_KERNEL),y) 112ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN),yy) 113KBUILD_IMAGE := $(boot)/loader.bin 114else 115KBUILD_IMAGE := $(boot)/Image.gz 116endif 117endif 118BOOT_TARGETS := Image Image.gz loader loader.bin xipImage 119 120all: $(notdir $(KBUILD_IMAGE)) 121 122$(BOOT_TARGETS): vmlinux 123 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 124 @$(kecho) ' Kernel: $(boot)/$@ is ready' 125 126Image.%: Image 127 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 128 129zinstall install: 130 $(Q)$(MAKE) $(build)=$(boot) $@ 131 132archclean: 133 $(Q)$(MAKE) $(clean)=$(boot) 134