1 # This file is included by the global makefile so that you can add your own
2 # architecture-specific flags and dependencies.
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
9 OBJCOPYFLAGS := -O binary
11 ifeq ($(CONFIG_DYNAMIC_FTRACE),y)
12 LDFLAGS_vmlinux := --no-relax
13 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
14 CC_FLAGS_FTRACE := -fpatchable-function-entry=8
17 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
18 KBUILD_CFLAGS_MODULE += -mcmodel=medany
22 ifeq ($(CONFIG_ARCH_RV64I),y)
24 UTS_MACHINE := riscv64
26 KBUILD_CFLAGS += -mabi=lp64
27 KBUILD_AFLAGS += -mabi=lp64
29 KBUILD_LDFLAGS += -melf64lriscv
32 UTS_MACHINE := riscv32
34 KBUILD_CFLAGS += -mabi=ilp32
35 KBUILD_AFLAGS += -mabi=ilp32
36 KBUILD_LDFLAGS += -melf32lriscv
39 ifeq ($(CONFIG_LD_IS_LLD),y)
40 KBUILD_CFLAGS += -mno-relax
41 KBUILD_AFLAGS += -mno-relax
42 ifndef CONFIG_AS_IS_LLVM
43 KBUILD_CFLAGS += -Wa,-mno-relax
44 KBUILD_AFLAGS += -Wa,-mno-relax
49 riscv-march-$(CONFIG_ARCH_RV32I) := rv32ima
50 riscv-march-$(CONFIG_ARCH_RV64I) := rv64ima
51 riscv-march-$(CONFIG_FPU) := $(riscv-march-y)fd
52 riscv-march-$(CONFIG_RISCV_ISA_C) := $(riscv-march-y)c
54 # Newer binutils versions default to ISA spec version 20191213 which moves some
55 # instructions from the I extension to the Zicsr and Zifencei extensions.
56 toolchain-need-zicsr-zifencei := $(call cc-option-yn, -march=$(riscv-march-y)_zicsr_zifencei)
57 riscv-march-$(toolchain-need-zicsr-zifencei) := $(riscv-march-y)_zicsr_zifencei
59 KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
60 KBUILD_AFLAGS += -march=$(riscv-march-y)
62 KBUILD_CFLAGS += -mno-save-restore
63 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
65 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
66 KBUILD_CFLAGS += -mcmodel=medlow
68 ifeq ($(CONFIG_CMODEL_MEDANY),y)
69 KBUILD_CFLAGS += -mcmodel=medany
71 ifeq ($(CONFIG_PERF_EVENTS),y)
72 KBUILD_CFLAGS += -fno-omit-frame-pointer
75 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
77 # GCC versions that support the "-mstrict-align" option default to allowing
78 # unaligned accesses. While unaligned accesses are explicitly allowed in the
79 # RISC-V ISA, they're emulated by machine mode traps on all extant
80 # architectures. It's faster to have GCC emit only aligned accesses.
81 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
83 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
84 prepare: stack_protector_prepare
85 stack_protector_prepare: prepare0
86 $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls \
87 -mstack-protector-guard-reg=tp \
88 -mstack-protector-guard-offset=$(shell \
89 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
90 include/generated/asm-offsets.h))
93 # arch specific predefines for sparse
94 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
96 # Default target when executing plain make
97 boot := arch/riscv/boot
98 ifeq ($(CONFIG_XIP_KERNEL),y)
99 KBUILD_IMAGE := $(boot)/xipImage
101 KBUILD_IMAGE := $(boot)/Image.gz
104 head-y := arch/riscv/kernel/head.o
106 core-$(CONFIG_RISCV_ERRATA_ALTERNATIVE) += arch/riscv/errata/
107 core-$(CONFIG_KVM) += arch/riscv/kvm/
109 libs-y += arch/riscv/lib/
110 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
112 PHONY += vdso_install
114 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
116 ifeq ($(KBUILD_EXTMOD),)
117 ifeq ($(CONFIG_MMU),y)
118 prepare: vdso_prepare
119 vdso_prepare: prepare0
120 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h
124 ifneq ($(CONFIG_XIP_KERNEL),y)
125 ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN),yy)
126 KBUILD_IMAGE := $(boot)/loader.bin
128 KBUILD_IMAGE := $(boot)/Image.gz
131 BOOT_TARGETS := Image Image.gz loader loader.bin xipImage
133 all: $(notdir $(KBUILD_IMAGE))
135 $(BOOT_TARGETS): vmlinux
136 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
137 @$(kecho) ' Kernel: $(boot)/$@ is ready'
140 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
142 install: install-image = Image
143 zinstall: install-image = Image.gz
145 $(CONFIG_SHELL) $(srctree)/$(boot)/install.sh $(KERNELRELEASE) \
146 $(boot)/$(install-image) System.map "$(INSTALL_PATH)"
148 PHONY += rv32_randconfig
150 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \
151 -f $(srctree)/Makefile randconfig
153 PHONY += rv64_randconfig
155 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \
156 -f $(srctree)/Makefile randconfig