arch/riscv/Makefile

   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
  11 OBJCOPYFLAGS    := -O binary
  12 LDFLAGS_vmlinux :=
  13 ifeq ($(CONFIG_DYNAMIC_FTRACE),y)
  14         LDFLAGS_vmlinux := --no-relax
  15 endif
  16 KBUILD_AFLAGS_MODULE += -fPIC
  17 KBUILD_CFLAGS_MODULE += -fPIC
  18
  19 KBUILD_DEFCONFIG = defconfig
  20
  21 export BITS
  22 ifeq ($(CONFIG_ARCH_RV64I),y)
  23         BITS := 64
  24         UTS_MACHINE := riscv64
  25
  26         KBUILD_CFLAGS += -mabi=lp64
  27         KBUILD_AFLAGS += -mabi=lp64
  28
  29         KBUILD_LDFLAGS += -melf64lriscv
  30 else
  31         BITS := 32
  32         UTS_MACHINE := riscv32
  33
  34         KBUILD_CFLAGS += -mabi=ilp32
  35         KBUILD_AFLAGS += -mabi=ilp32
  36         KBUILD_LDFLAGS += -melf32lriscv
  37 endif
  38
  39 KBUILD_CFLAGS += -Wall
  40
  41 # ISA string setting
  42 riscv-march-$(CONFIG_ARCH_RV32I)        := rv32im
  43 riscv-march-$(CONFIG_ARCH_RV64I)        := rv64im
  44 riscv-march-$(CONFIG_RISCV_ISA_A)       := $(riscv-march-y)a
  45 riscv-march-$(CONFIG_FPU)               := $(riscv-march-y)fd
  46 riscv-march-$(CONFIG_RISCV_ISA_C)       := $(riscv-march-y)c
  47 KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
  48 KBUILD_AFLAGS += -march=$(riscv-march-y)
  49
  50 KBUILD_CFLAGS += -mno-save-restore
  51 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
  52
  53 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  54         KBUILD_CFLAGS += -mcmodel=medlow
  55 endif
  56 ifeq ($(CONFIG_CMODEL_MEDANY),y)
  57         KBUILD_CFLAGS += -mcmodel=medany
  58 endif
  59 ifeq ($(CONFIG_MODULE_SECTIONS),y)
  60         KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/riscv/kernel/module.lds
  61 endif
  62
  63 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
  64
  65 # GCC versions that support the "-mstrict-align" option default to allowing
  66 # unaligned accesses.  While unaligned accesses are explicitly allowed in the
  67 # RISC-V ISA, they're emulated by machine mode traps on all extant
  68 # architectures.  It's faster to have GCC emit only aligned accesses.
  69 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
  70
  71 # arch specific predefines for sparse
  72 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
  73
  74 # Default target when executing plain make
  75 boot            := arch/riscv/boot
  76 KBUILD_IMAGE    := $(boot)/Image.gz
  77
  78 head-y := arch/riscv/kernel/head.o
  79
  80 core-y += arch/riscv/kernel/ arch/riscv/mm/ arch/riscv/net/
  81
  82 libs-y += arch/riscv/lib/
  83
  84 PHONY += vdso_install
  85 vdso_install:
  86         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
  87
  88 all: Image.gz
  89
  90 Image: vmlinux
  91         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
  92
  93 Image.%: Image
  94         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
  95
  96 zinstall install:
  97         $(Q)$(MAKE) $(build)=$(boot) $@