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 ($(CONFIG_DYNAMIC_FTRACE),y)
14 LDFLAGS_vmlinux := --no-relax
16 KBUILD_AFLAGS_MODULE += -fPIC
17 KBUILD_CFLAGS_MODULE += -fPIC
19 KBUILD_DEFCONFIG = defconfig
22 ifeq ($(CONFIG_ARCH_RV64I),y)
24 UTS_MACHINE := riscv64
26 KBUILD_CFLAGS += -mabi=lp64
27 KBUILD_AFLAGS += -mabi=lp64
29 KBUILD_CFLAGS += $(call cc-ifversion, -ge, 0500, -DCONFIG_ARCH_SUPPORTS_INT128)
32 KBUILD_LDFLAGS += -melf64lriscv
35 UTS_MACHINE := riscv32
37 KBUILD_CFLAGS += -mabi=ilp32
38 KBUILD_AFLAGS += -mabi=ilp32
40 KBUILD_LDFLAGS += -melf32lriscv
43 KBUILD_CFLAGS += -Wall
45 ifeq ($(CONFIG_RISCV_ISA_A),y)
48 ifeq ($(CONFIG_RISCV_ISA_C),y)
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 ifeq ($(toolchain-need-zicsr-zifencei),y)
56 KBUILD_ARCH_ZISCR_ZIFENCEI = _zicsr_zifencei
59 KBUILD_AFLAGS += -march=$(KBUILD_MARCH)$(KBUILD_ARCH_A)fd$(KBUILD_ARCH_C)$(KBUILD_ARCH_ZISCR_ZIFENCEI)
61 KBUILD_CFLAGS += -march=$(KBUILD_MARCH)$(KBUILD_ARCH_A)$(KBUILD_ARCH_C)$(KBUILD_ARCH_ZISCR_ZIFENCEI)
62 KBUILD_CFLAGS += -mno-save-restore
63 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(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_MODULE_SECTIONS),y)
72 KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/riscv/kernel/module.lds
75 # Avoid generating .eh_frame sections.
76 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
78 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
79 KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax)
81 # GCC versions that support the "-mstrict-align" option default to allowing
82 # unaligned accesses. While unaligned accesses are explicitly allowed in the
83 # RISC-V ISA, they're emulated by machine mode traps on all extant
84 # architectures. It's faster to have GCC emit only aligned accesses.
85 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
87 # arch specific predefines for sparse
88 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
90 head-y := arch/riscv/kernel/head.o
92 core-y += arch/riscv/kernel/ arch/riscv/mm/
94 libs-y += arch/riscv/lib/
98 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@