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 ($(CONFIG_LD_IS_LLD),y)
38 ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 150000; echo $$?),0)
39 KBUILD_CFLAGS += -mno-relax
40 KBUILD_AFLAGS += -mno-relax
42 KBUILD_CFLAGS += -Wa,-mno-relax
43 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_MODULE_SECTIONS),y)
72 KBUILD_LDS_MODULE += $(srctree)/arch/riscv/kernel/module.lds
74 ifeq ($(CONFIG_PERF_EVENTS),y)
75 KBUILD_CFLAGS += -fno-omit-frame-pointer
78 # Avoid generating .eh_frame sections.
79 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
81 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
82 KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax)
84 # GCC versions that support the "-mstrict-align" option default to allowing
85 # unaligned accesses. While unaligned accesses are explicitly allowed in the
86 # RISC-V ISA, they're emulated by machine mode traps on all extant
87 # architectures. It's faster to have GCC emit only aligned accesses.
88 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
90 # arch specific predefines for sparse
91 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
93 # Default target when executing plain make
94 boot := arch/riscv/boot
95 KBUILD_IMAGE := $(boot)/Image.gz
97 head-y := arch/riscv/kernel/head.o
101 libs-y += arch/riscv/lib/
103 PHONY += vdso_install
105 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
110 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
113 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
116 $(Q)$(MAKE) $(build)=$(boot) $@