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
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
11 OBJCOPYFLAGS := -O binary
13 ifeq ($(CONFIG_DYNAMIC_FTRACE),y)
14 LDFLAGS_vmlinux := --no-relax
16 KBUILD_AFLAGS_MODULE += -fPIC
17 KBUILD_CFLAGS_MODULE += -fPIC
20 ifeq ($(CONFIG_ARCH_RV64I),y)
22 UTS_MACHINE := riscv64
24 KBUILD_CFLAGS += -mabi=lp64
25 KBUILD_AFLAGS += -mabi=lp64
27 KBUILD_LDFLAGS += -melf64lriscv
30 UTS_MACHINE := riscv32
32 KBUILD_CFLAGS += -mabi=ilp32
33 KBUILD_AFLAGS += -mabi=ilp32
34 KBUILD_LDFLAGS += -melf32lriscv
37 ifeq ($(CONFIG_LD_IS_LLD),y)
38 KBUILD_CFLAGS += -mno-relax
39 KBUILD_AFLAGS += -mno-relax
41 KBUILD_CFLAGS += -Wa,-mno-relax
42 KBUILD_AFLAGS += -Wa,-mno-relax
47 riscv-march-$(CONFIG_ARCH_RV32I) := rv32ima
48 riscv-march-$(CONFIG_ARCH_RV64I) := rv64ima
49 riscv-march-$(CONFIG_FPU) := $(riscv-march-y)fd
50 riscv-march-$(CONFIG_RISCV_ISA_C) := $(riscv-march-y)c
52 # Newer binutils versions default to ISA spec version 20191213 which moves some
53 # instructions from the I extension to the Zicsr and Zifencei extensions.
54 toolchain-need-zicsr-zifencei := $(call cc-option-yn, -march=$(riscv-march-y)_zicsr_zifencei)
55 riscv-march-$(toolchain-need-zicsr-zifencei) := $(riscv-march-y)_zicsr_zifencei
57 KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
58 KBUILD_AFLAGS += -march=$(riscv-march-y)
60 KBUILD_CFLAGS += -mno-save-restore
61 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
63 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
64 KBUILD_CFLAGS += -mcmodel=medlow
66 ifeq ($(CONFIG_CMODEL_MEDANY),y)
67 KBUILD_CFLAGS += -mcmodel=medany
69 ifeq ($(CONFIG_MODULE_SECTIONS),y)
70 KBUILD_LDS_MODULE += $(srctree)/arch/riscv/kernel/module.lds
72 ifeq ($(CONFIG_PERF_EVENTS),y)
73 KBUILD_CFLAGS += -fno-omit-frame-pointer
76 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
78 # GCC versions that support the "-mstrict-align" option default to allowing
79 # unaligned accesses. While unaligned accesses are explicitly allowed in the
80 # RISC-V ISA, they're emulated by machine mode traps on all extant
81 # architectures. It's faster to have GCC emit only aligned accesses.
82 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
84 # arch specific predefines for sparse
85 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
87 # Default target when executing plain make
88 boot := arch/riscv/boot
89 KBUILD_IMAGE := $(boot)/Image.gz
91 head-y := arch/riscv/kernel/head.o
95 libs-y += arch/riscv/lib/
99 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
104 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
107 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
110 $(Q)$(MAKE) $(build)=$(boot) $@